Thor must be truly desperate to come to Loki for help, the bad guy opines in the extended "Thor: The Dark World" TV spot.

He is, when faced when an enemy that even Odin and Asgard cannot withstand.

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The titular God with the big hammer (Chris Hemsworth) has returned, but this time he needs help from his evil adopted brother and arch nemesis, Loki (Tom Hiddleston).

The family reunion will not be all hugs and nostalgia.

"Thor: The Dark World" also stars Natalie Portman, Kat Dennings, Idris Elba and Anthony Hopkins. The sequel hits theaters Nov. 8.

Watch the sneak peek: