Hulk follows The Leader back in time to the Viking Age where they are apprehended by a young Thor and Loki who accuse them of trying to steal the fragments of the Berserker Staff. When Odin goes into his Odinsleep, Hulk teams up with Thor and Loki to keep Leader from taking the Asgardian throne from Odin. In the present, the Agents of S.M.A.S.H. fight to stop "All Father" Leader from taking over the planet with Thor and Loki in his services as well as an army of Gamma Frost Giants.