Loki, the trickster god, is at large. He is causing chaos and mayhem throughout Asgard, and it is up to the heroes to stop him. Things could be rougher than usual, though, as one of the heroes might be teaming up with Loki. A traitor is among the ranks.

The Tales of Asgard expansion for Marvel United gives players a new set of challenges and options for their games. Players can battle a new villain, the trickster god Loki, who is causing trouble around the six new Asgard locations. However, the heroes are aided by a trio of new faces, including Thor, Valkyrie and Korg. But there could be a traitor in the group, as the new traitor challenge will add a new wrinkle to the gameplay.