Life as a high school freshman can be tough - but even tougher when you're trying to control your new superhero ghost powers. This is the plight of Danny Fenton, as he adjusts to the after effects of the lab accident that has turned him into Danny Phantom - half boy, half ghost, all hero. When Danny's friend Sam converts the school cafeteria to a recycled veggie menu, Danny must spring into action to thwart an angry Lunch Lady Ghost, who's serving up a heaping helping of the "3 M's": Mayhem, malice, and meat!
Lucky Danny is going to his first high school dance with his ultimate crush, Paulina - a very popular-but-shallow girl who is only going with him to spite Sam, who can't stand her. Meanwhile, Danny discovers that he has the ghostly power to "overshadow" and inhabit the bodies of others - which comes in handy when his dad, Jack, is called in for a parent/teacher conference to discuss Danny's shortcomings. Danny's plan backfires when his teacher, Mr. Lancer, pegs the overshadowed Jack as a chaperone for the dance.
When Danny's after-school ghost activities cause his already mediocre grades to slip, he calls upon his friends Sam and Tucker to help him efficiently manage his time. While on a scheduled extra credit biology assignment to study a rare gorilla in captivity, Danny finds himself hunted by Skulker - an armored ghost determined to add Danny to his collection of rare and unusual poltergeists.
Danny needs quick cash to buy cool clothes for his first "A-list" homecoming party at football-jock Dash Baxter's house. What better way, then, than selling all your parents' ghost-infected, mechanized junk at a yard sale? It's a great idea until Nicolai Technus, Ghost Master of Technology, summons all ghost gadgets to morph into a giant killer techno-robot. Danny foils Technus' evil plan with the help of Tucker and Sam, while learning that there are some things that money can't buy - like true friendship.
After a series of humiliating run-ins with Dash (the school bully), Danny uses his powers to get revenge. Unfortunately, this triggers the ghost of Poindexter - a kid who was shoved in his locker so many times, he haunts it to this day. Danny must battle this ghostly defender of nerds and geeks, while at the same time proving he's not the bully Poindexter thinks he is.
When Desiree - a ghost that can grant wishes - gives Tucker (Danny's best friend) ghost powers, Danny finds himself dealing with his friend's jealousy in the worst way possible: by having to fight him.
Danny meets his evil opposite in Vlad Plasmius - a childhood rival of his father that also got ghost powers in an accident. Unfortunately, Vlad's had those powers for 20 years which means he's stronger, more experienced and hell-bent on taking everything away from Jack Fenton, including his life.
Danny thinks he's going to cause his parents to split up when he knocks Jack's anniversary gift into the Ghost Zone. Desperate to retrieve it, he dives into this ghostly dimension where he runs afoul of Walker: the Ghost Warden of a Ghost Jail. Worse, Danny is thrown into prison, with every ghost he's ever caught.
Jazz has noticed a change in Danny ever since "the accident in the lab." His disappearances, his late nights; basically, she mistakes his ghost hunting for depression and signs him up for therapy with Penelope Spectra. What Jazz doesn't know is that Spectra is a ghost who feeds off teen misery, and her involvement only makes things worse!
When ghosts destroy a student's life and popularity in school, she dedicates her life to hunting ghosts. Now Danny has to deal with a threat only a few lockers down the hall, and worse? Danny's best friend, Tucker, has a crush on her.
Danny and Sam find their platonic friendship turned forcibly romantic through the musical powers of Ember, a hard rocking girl ghost who feeds off the idol worship of teens. With her massive, free concert scheduled only a few days away - a concert that will be broadcast worldwide and give her ultimate power - Sam has to get the now completely and utterly love-addled Danny to focus on fighting ghosts - even if it means breaking his heart.
Figuring out the best way to be both a high school freshman and a brand new superhero has always been a bit of a balancing act for Danny - but it's gotten even more difficult, with both Lancer and his parents putting pressure on him to ace a make up test. Of course, this is the same time that Technus - ghost master of technology - has escaped into Danny's online game! And if they don't stop him, he'll escape into the internet and take over every computer in the world!
In an attempt to beat Dash in a haunted house decorating contest, Danny "borrows" the enchanted sword of the Spirit of Halloween, the Fright Knight! When the evil, ghostly knight comes to retrieve his magic saber, he decides to stick around long enough to turn the real world into his own stormy realm of terror.
Jazz falls for a hunky boy ghost - Johnny 13 - who has the power to cast his shadow out and create bad luck for everyone who crosses him, especially the girls he's dating. Danny finds himself in the uncomfortable position of behaving like an overprotective parent, much to Jack and Maddie's pride and Jazz's fury. Danny has to beat Johnny back into the Ghost Zone before Jazz fully accepts Johnny's offer to go steady - or else!
Amity Park is thrown into chaos by the town's first mass invasion of ghosts. It's all part of a plan by the Ghost Zone's Sheriff Walker to capture Danny Phantom. As Danny first battles, then befriends, a hulking ghost named Wulf, Walker and his deputies "overshadow" most of the people in Danny's inner circle.
When Paulina witnesses Danny's ghost transformation, he fears the exposure. Imagine his surprise when Paulina swears to keep his secret - then becomes his girlfriend! Life is great for Danny, until he finds out that Paulina has actually been overshadowed by Johnny 13's girlfriend, Kitty, in her plot to make Johnny jealous. Danny reluctantly plays along to protect his own identity, but, when Kitty's welcome wears thin, Danny pleads with Johnny 13 to take her back.
Maddie relishes the chance to bond with emotionally distant Danny at a weekend mother/son science seminar. However, the seminar is a ruse orchestrated by Vlad Masters - a.k.a. Vlad Plasmus, Danny's arch enemy! Vlad's plan is to convince Maddie and Danny to live with him while simultaneously destroying Jack with a massive ghost attack. When Vlad short-circuits Danny's powers, Danny gets to witness Maddie's impressive ghost fighting prowess. Meanwhile, a reluctant Jazz is pressed into ghost-fighting duty with Jack - and likes it, in spite of herself!
Danny and Valerie Gray are forced to become "parents" to a sack of flour for a one-week school assignment. At the same time Skulker, ghost hunter extraordinaire, decides to pit Valerie and Danny Phantom against each other in a contest - with the winner earning the privilege of becoming his prey.
When Vlad Masters' ghost portal explodes, he schemes to replace it by stealing Jack Fenton's portal. As a distraction, Vlad anonymously offers a million-dollar bounty to eliminate Danny Phantom. As ghost hunters from around the world gather in Amity Park to hunt the ghost kid, Danny sacrifices himself to Jack - both to win the prize money for Dad and to bolster Jack's inept reputation, which embarrasses Danny. However, when Maddie's life is put in jeopardy, Jack needs no help from Danny to save the day on his own.
Sam rebels when her overprotective parents forbid her from attending the strange Goth circus that's come to town. Little does she know that the circus performers are ghosts, under the mystical control of the creepy ringmaster named Freakshow, who also uses the ghosts to loot the town. When Danny falls under Freakshow's spell and joins the circus - and the robbery spree - Sam must operate under the radar to destroy Freakshow's magic crystal ball, free Danny and get grounded, big-time.
Danny and Sam get into a fight, and when Sam utters the words, "I sometimes wish I'd never met you," she finds herself in a world in which she and Danny are strangers. Worse than that, since it was Sam who encouraged Danny to check out the Fenton Portal the night he got his ghost powers, Danny doesn't have any powers! This is good news for Desiree, who granted Sam's wish and plans to gain ultimate power by granting everyone's wishes beneath a shower of shooting stars.
After being bitten by tiny green ghost beetles, the kids of Casper High get a mysterious illness that gives them ghost powers and are quarantined at a spooky old hospital outside of town. When Danny sneaks into the hospital to investigate, he is captured by Penelope Spectra and her assistant, Bertrand. They are the ones who started this illness as part of their plan to build Penelope a young and beautiful new body. All she needs is Danny's half-human/half-ghost DNA to complete her ghostly plan.
A group of ghostly skeletons under the command of a bratty 10-year-old pirate named Youngblood attacks Fenton Works and steals the ghost shield. Soon after, all the adults in Amity Park are packing for a cruise without their kids. Danny, Sam and Tucker discover that the cruise is a hoax and the adults are under the spell of a mysterious (and cheesy) song created by Ember to make them into galley slaves for Youngblood's pirate ship!
Vlad Plasmius is in the Ghost Zone, in the lair of the powerful and utterly evil Ghost King. His attempt to steal the Ghost King's Ring of Rage and Crown of Fire only succeed in waking the King from his forever sleep. The Ghost King summons the Fright Knight to pursue his stolen ring, and soon Amity Park is under attack. When the Fright Knight fails to return the treasure, the Ghost King pulls Amity Park into the Ghost Zone and threatens to destroy it. Danny steals Jack's untested battle suit to wage war against the Ghost King. With the help of his ghostly enemies, including a reluctant Vlad, Danny is able to trap the Ghost King back in his forever sleep. The town of Amity Park is freed from the Ghost Zone, and Vlad sneaks away with not only the stolen ring, but Jack's Ecto-Skeleton battle suit, which he hopes to use in the future.
Technus is back! But this is a new and improved Technus, a smoother operator who refuses to shout out his plans. Danny's not worried, especially after he accidentally splits himself in two and decides to leave the ghost hunting to his superhero side and allow his teen self some time off to just be "normal." After Technus electronically infiltrates the Fenton RV, both Danny's must work together to defeat him before he drains all the power from Amity Park!
Danny Fenton is losing his mind! At least, that's what Jazz decides when her little brother starts acting strangely and fighting ghosts that aren't there. In reality, Danny is being tormented by a revenge-seeking Youngblood, who cannot be seen by adults - or by big sisters who think they're adults. When Jazz sells the family on a ghost-tech-free camping trip, Youngblood follows and unleashes a series of juvenile attacks that make Danny seem even crazier, and put the Fenton family in danger.
It's time for Danny and his classmates to take their Career Aptitude Tests, and Danny is freaking out. He's been so busy hunting ghosts that he hasn't had any time to study or think about his future. But, far in the distant reaches of the Ghost Zone, a group of beings called the Observants has been keeping an eye on Danny's future, and don't like what they see. Danny's decision to cheat on the test causes a tragic chain reaction that spells doom for all of Amity Park.
Danny Fenton hates Christmas. When he accidentally destroys the only copy of a ghostly Christmas story, the book's author, Ghost Writer, makes Danny hate the holiday even more by turning him into the main character of a brand new Yuletide tale. Danny is now trapped in a scenario where everyone talks in rhyme! With his magical Quantum Keyboard, Ghost Writer creates a series of catastrophes that threaten to ruin Christmas for all of Amity Park and pins the blame on Danny. When Danny goes into the Ghost Zone to confront Ghost Writer, he is surprised to find his old ghostly enemies in a giving mood. Danny enlists them to help him defeat the Ghost Writer and restore the spirit of Christmas to Amity Park and, perhaps, to his own heart.
Skulker's on a looting spree, snatching up a number of seemingly unrelated items. Unfortunately, Danny's attempts to stop him are thwarted by the well-intentioned meddling of Danny's new sidekick: Jazz. Danny didn't ask for - and doesn't want - Jazz's help, and after a series of humiliating mishaps, Danny blows up at his sister. In response, Jazz runs away from home - to Vlad's castle in Wisconsin!
Technus is back, with a new plan to beam himself up to a super satellite and take over the world, and he's going to use Axion Labs to do it. As Danny Phantom battles Technus, Danny Fenton begins battling his feelings for Valerie, whose dad is back in charge at Axion. Sam and Tucker are surprised when Danny confesses he's thinking of asking Valerie to go steady. Unfortunately, as Technus puts his plan into action at Axion Labs, Valerie realizes her role as ghost hunter is putting her family and friends in danger.
Although Danny Phantom can perform extraordinary physical feats, Danny Fenton is still something of a weakling. For this reason, Dash is assigned as Danny's "fitness buddy" to help him prepare for the Presidential Fitness Test at school. When Skulker appears at Fenton Works on his usual hunt, Danny Phantom, Dash, and Skulker are accidentally hit with Jack's new "Fenton Crammer," which shrinks them all to a half-inch tall! Worse yet, Danny's ghost powers don't work so well in his tiny form.
Sam can barely contain her contempt for the "Miss Teenage Happy Princess" beauty pageant and its organizer, Dora Mattingly, when they descend on Casper High. She decides to enter the contest to make a statement about individuality, but makes a discovery instead: Dora Mattingly is the Dragon Ghost! Before she can get to the bottom of the mystery, she's inadvertently crowned Miss Teenage Happy Princess by its happy-go-lucky judge, Danny Fenton!
Tucker's running for student body president, but no one's paying his campaign any notice, and that includes his campaign managers: Danny and Sam. On a field trip to a museum to look at ancient Egyptian artifacts, everyone is surprised that the pharaoh in question looks just like Tucker. And when Tucker looks in a ghostly mirror, his image brings the pharaoh's minion, Hotep RA, to life!
Vlad is back, only now he's dying of ecto-acne, a direct result of the lab accident with Jack and Maddie years ago. To ensure Danny helps him find a cure, Vlad infects Sam and Tucker, forcing Danny to turn to Clockwork to help. He heads back in time, to the college days of his parents and Vlad, to make sure the accident that injures Vlad never happens. Only by doing so, he changes the present - now Maddie's married to Vlad and living in Wisconsin, and Jack's an evil ghost named Jack Plasmius!
Vlad's up to something and it involves Danny. After he sends three ghosts to Amity Park to battle Danny Phantom, we find out that he's working on his creepiest project yet: a clone of Danny Phantom. So far, the clones he creates can't sustain their forms for very long, but Vlad is determined to succeed. Danny doesn't have long to worry about Vlad's ghostly visitors, however, because he's distracted by the appearance of Danielle, a cousin he didn't know he had. And then, Danielle reveals that she too has ghost powers - she's Dani Phantom!
Sam's got a new crush: Gregor, a goth transfer student from Europe. And Danny's jealous, although he won't admit it. Instead, he convinces himself that Gregor is an undercover operative for the Guys in White, out to get Danny Phantom. When Sam finds out Danny has been spying on her, she's furious, but Danny's suspicion grows when the Guys in White show up in Amity Park.
School's out and Danny has nothing on his mind except a relaxing, fun and a ghost-free summer vacation. His dream is quickly destroyed when Freakshow, a villainous ringmaster with ghostly minions, escapes from jail. Danny, caught off guard, is forced to forfeit his summer plans when Freakshow manages to reveal Danny's secret identity to the entire world! To make matters worse, Freakshow kidnaps Danny, Sam, and Tucker's families and uses them as pawns in this evil game of revenge.
Danny helps pull a thorn out an abominable snowman-like creature who presides over the chilliest area of the Ghost Zone. To show his gratitude, Frostbite reveals to Danny the Infi-Map, a map of all the secret worlds.
Kitty, Ember and Penelope Spectra are sick of the ghost-men in their lives, and they're going to do something about it by making all the men of Amity Park disappear. Except Danny and Jack are on a fishing trip!
Amity Park is in the midst of a drought, and Mayor Vlad releases Vortex, the weather ghost, to make it rain. But when Vlad double-crosses Vortex, the ghost conjures a storm that threatens to drown Amity Park!
The Guys in White have finally caught on: Jack's a genius, how could they have not seen this before? They offer Jack and Maddie millions for Fenton Works before you can say "movin' on up" -- right next to mayor Vlad!
It's a whole new world for Danny Fenton – he's getting A's, he's the quarterback of the football team, he and Tucker are best pals with Dash, and Sam is his girlfriend. What? Turns out it's all a dream!
Danny defeats Vlad in an outer space battle, prompting Plasmius to exact revenge, which he does by creating Masters' Blasters, a team of hip ghost fighters whose amazing prowess renders Danny Phantom unnecessary.