The Avengers: Earths Mightiest Heroes Episode 12 - Gamma World, Part 1 Episode Title:Gamma World, Part 1.Episode Description:The Leader has placed an expanding dome of pure gamma radiation around the Cube, with anyone caught inside it being mutated into a Gamma Monster. The Avengers, along with the support of S.H.I.E.L.D., enter the Cube in an attempt to the destroy the Gamma Generator.