Anthony Hopkins has signed on to star in Marvel Studios' upcoming adaptation of Thor, which Kenneth Branagh is directing.

According to Variety, Hopkins will play Odin, the father of Thor and Loki. Chris Hemsworth is playing Thor, and Tom Hiddleston plays Loki.

Natalie Portman is also set to play Thor's love interest, Jane Foster.

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Scripted by Mark Protosevich and Zack Stentz, the film tracks partly disabled med student Dr. Donald Blake's discovery of his Norse god alter ego, the hammer-swinging Thor.

Production is set to begin in January, for a theatrical release May 20, 2011.