(Cover) - EN Showbiz - Kenneth Branagh has unveiled some secrets about the Thor movies villains, saying an unhappy brother is a dangerous relative to have.

The Thor director has discussed the complexities of the trio of rogues in the upcoming movie, which is released in May.

The movie stars Chris Hemsworth as Thor - a warrior who is cast out of the realm of Asgard and sent to live amongst humans on Earth, where he soon becomes one of their powerful defenders. The Australian actor, 27, stars alongside Natalie Portman and Sir Anthony Hopkins.

In the film, based on the popular Marvel comic, Thor faces three villains. The first is Thors brother Loki played by Tom Hiddleston - a bitter sibling out to undercut Thor and usurp their father, Odin, who is played by Anthony.

A brother who is unhappy is a dangerous relative to have, director Kenneth Branagh told EW.

The story also includes a clash with an ice planet and the final villain who is an incredible war machine known as The Destroyer.

The brand new Thor trailer debuted today. As well as including more footage of The Destroyer and the mortal enemies, the Frost Giants, there are also a scenes showcasing the films humour.

The trailer includes shots of Natalie, who plays Jane Foster, and Kat Dennings as who portrays Darcy the latter of which seems to provide many of the films lighter moments.

Thor hits cinemas May 6, 2011. (C) Cover Media