Thor” helmer Kenneth Branagh has locked Stuart Townsend, Ray Stevenson and Tadanobu Asano to play Warrior’s Three, a trio of Asgardian adventurers who fight alongside the Norse god in the Marvel Entertainment drama.

Townsend, who last wrote and directed “Battle in Seattle,” plays Fandral, a character that was drawn in the comicbook series based on Errol Flynn and his movies. Stevenson, the “Rome” star, plays Volstagg the Valiant, a hard-living brawler inspired by Shakespeare’s Falstaff. Asano, best known for starring in “Mongol,” plays Hogun the Grim, the third warrior and traveling companion of the hammer-swinging Thor, who is played by Chris Hemsworth.

Anthony Hop­kins, Tom Hiddleston and Natalie Portman also star in the pic scripted by Mark Protosevich, Zack Stentz and Ashley Miller. Paramount Pictures will release “Thor” on May 20, 2011.

Stevenson, who’ll next be seen starring with Denzel Washington in “The Book of Eli,” is shooting the Adam McKay-directed “The Other Guys” with Mark Wahlberg and Will Ferrell. He’s repped by WME, Townsend by UTA and Asano by CAA.