Danny Phantom - Season 2 - Eps 1: Memory Blank
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! Now, Sam must convince Danny that they share a friendship and a history, and lead him back to the Fenton Portal for a second "accident" so he can again become Danny Phantom.
About Danny Phantom

Title: Danny Phantom
First Air Date: 2004-04-03
Last Air Date: 2007-08-24
Status: Ended
Rating: 8.3/10 (from 1101 votes)
Language: EN
Seasons: 3
Total Episodes: 49
Network: Nickelodeon
Genres: Action & Adventure, Animation, Comedy, Sci-Fi & Fantasy
Production Companies: Billionfold, Nickelodeon Animation Studio, Nickelodeon Productions
Synopsis
Danny Fenton was once your typical kid until he accidentally blew up his parents' laboratory and became ghost-hunting superhero Danny Phantom. Now half-ghost, Danny's picked up paranormal powers, but only his sister, Jazz, and best friends, Samantha and Tucker, know his secret. Danny's busy fighting ghosts, saving Casper High and hiding his new identity all while trying to graduate.
Cast

David Kaufman
Danny Fenton / Danny Phantom (voice)

Grey DeLisle
Samantha 'Sam' Manson (voice)

Rickey D'Shon Collins
Tucker Foley (voice)

Colleen O'Shaughnessey
Jasmine 'Jazz' Fenton (voice)

Rob Paulsen
Jack Fenton (voice)

Kath Soucie
Madeline Fenton (voice)

Ron Perlman
Vice Principal Lancer (voice)