Fan Casting Fantastic Four: Negative Zone (2011)

Richards discovers a dimension, dubbing it the Negative Zone, N-Zone for short. There the four encounter the alien, Nihil. Nihil, Hellbent on destroying the Fantastic Four and their world, bides his time until the team is weak enough so that he can kill them all and take over their Earth, but fortunately, Johnny's suspicion of Nihil leads him to fake being sick so he can return home and come back with reinforcements.