Thor is battling to save humanity again ... but this time, he's on his own.

Following the events of "The Avengers," the blonde god (played by Chris Hemsworth) goes solo in November's "Thor: The Dark World" -- where he's seen taking Malekith and his army of Dark Elves.

The brand new trailer gives us a much better look at the new villain, as well as footage of the title hero reuniting with his brother Loki (Tom Hiddleston).

"I need your help and I wish I could trust you," Thor is seen telling his caged sibling. "It you did, you'd be the fool I always thought you were," Loki replies.

The trailer is also packed with action featuring returning characters like Jane Foster (Natalie Portman), Sif (Jaimie Alexander), Heimdall (Idris Elba), Frigga (Rene Russo) and Odin (Anthony Hopkins).

The movie opens November 8 ... and it can't get here fast enough!

Want more Loki in your life? Check out Tom Hiddleston's AMAZING Comic-Con appearance just last month -- showing up in full on costume for a Hall H surprise.

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