Danny Phantom

Danny is in the lab before school, and Jack has a new invention - the Fenton Ghost Fisher. Jack has to leave for a moment to use the restroom, and meanwhile the fisher reels in a dragon ghost. Danny fights the dragon, and then the amulet which gave the dragon the power falls into Danny's backpack. The dragon turns into some ghost girl. Danny is completely baffled.
Later, at school, the dance is coming up in a matter of days and Danny, Tuck, and Sam have no dates. Sam didn't really care, but the guys were desperate. While eating lunch outside, Danny sees the beauty, Paulina. He goes up to ask her to the dance, then his ghost powers cause his pants to fall. Paulina starts laughing at Danny, so Sam confronts Paulina. Sam calls her shallow. Paulina thinks that Sam is Danny's girlfriend, so she tries to steal him from her.
Later in the hallway, Paulina confronts Danny at his locker. Dash interrupts Danny and shoves him into a locker, Danny then discovers his power of possessing people, or overshadowing them. He overshadows Dash and embarrasses him in front of Paulina, then the amulet from earlier falls out of Danny's backpack, Paulina sees it and wears it, then she says she'd go to the dance with Danny. Danny's pants fall down again, he gets in trouble by Mr. Lancer, and he wants to discuss the pants issue with his parents.
Danny goes home, but he's too afraid to tell his father about the issue, so he overshadows him, and takes him to the conference. He makes up things in the conference to flatter Mr. Lancer. Lancer likes Mr. Fenton's so much (who is really Danny) he lets him chaperone the school dance.
Later, Danny, Sam, and Tucker are in the mall, at the same time Paulina is in a store, shopping for a shirt, while wearing the amulet. They don't have the shirt in her so she becomes furious, the dragon becomes unleashed, and Danny fights the dragon. Paulina returns back to her normal self and forgets everything that happened.
The trio research about the amulet on the internet and they learn what triggers its power; extreme distress or anger leads the person wearing the amulet to transform into a dragon.
It's dance night, and Sam is going with Tucker. Danny's also going with Paulina, he has to get back the amulet and deal with overshadowing his father. Sam and Paulina go to the restroom. Paulina learns that Sam is just Danny's friend, so she gives back the amulet. Sam gets furious, so she turns into the dragon. Danny captures the dragon with the Fenton Fisher, and the amulet comes off. Sam forgets what happened. There's time for one more dance, so Danny and Sam slow dance together.