Fantastic Four: World's Greatest Heroes - Season 1 - Eps 2: Doomed
Dr. Doom manages to transfer his mind into Reed's body by hacking his consciousness. Reed, who is now trapped in Dr. Doom's body, must now figure out a way to return to his friends and family, or else Dr. Doom will destroy the Fantastic Four and several city blocks by transforming the Baxter Building into his new weapon.
About Fantastic Four: World's Greatest Heroes

Title: Fantastic Four: World's Greatest Heroes
First Air Date: 2006-09-02
Last Air Date: 2007-10-20
Status: Ended
Rating: 7.5/10 (from 89 votes)
Language: EN
Seasons: 2
Total Episodes: 26
Network: Cartoon Network
Genres: Animation, Action & Adventure, Sci-Fi & Fantasy, Kids
Production Companies: MoonScoop, Marvel Entertainment
Synopsis
Mr. Fantastic, the Invisible Woman, the Human Torch, and the Thing battle some of their greatest foes, including Doctor Doom, Ronan the Accuser, the Multiple Man, and Mole Man.
Cast

Hiro Kanagawa
Mr. Fantastic (voice)

Lara Gilchrist
Invisible Woman (voice)

Christopher Jacot
Johnny Storm (voice)

Brian Dobson
Ben Grimm (voice)