Marvel's Hulk and the Agents of S.M.A.S.H. (2013)

S02E20 Days of Future Smash: Part 2 - Smashguard

Hulk tracks Leader to the Viking Age, where he joins forces with a young Thor and Loki. Together, the Agents of S.M.A.S.H. battle against "All Father" Leader's sinister plans to seize control of the Earth.