Fantastic Four: World's Greatest Heroes

Season 1, Episode 21

Episode Title: Atlantis Attacks

Air Date: 2007-09-15

Overview:

The Sub-Mariner returns, but this time he needs help to defeat Attuma, who has taken over Atlantis. While Reed, Susan, and Ben head off to help free Atlantis, Johnny stays behind and faces an attack on the city from a giant mutant whale.