<P> Upon graduating from RADA, Hiddleston was cast in his first film role, playing Oakley in Joanna Hogg's first feature film, Unrelated (2006). His sister Emma also appeared in the film as Badge . Casting director, Lucy Bevan, who cast him in the film said "there was just a fantastic confidence about him". Hiddleston had leading roles in Declan Donnellan's company Cheek by Jowl's productions The Changeling (2006), and Cymbeline (2007). For the latter he won the Laurence Olivier Award for Best Newcomer in a Play . His Donmar Warehouse credits include Cassio in Michael Grandage's production of Shakespeare's Othello (2008) alongside Chiwetel Ejiofor and Ewan McGregor, and Lvov in the West End revival of Chekhov's Ivanov (2008) with Kenneth Branagh . </P> <P> Hiddleston was the voiceover for BBC's documentary on the Galapagos Island in 2006 . He also narrated the audiobook The Red Necklace by Sally Gardner in 2007, Hiddleston played the leading role of Edward in Hogg's second feature, Archipelago (2010). His TV credits include Magnus Martinsson in the BBC detective drama Wallander (2008), Bill Hazledine in Suburban Shootout (2006), John Plumptre in the BBC costume drama TV film Miss Austen Regrets (2008) and William Buxton in the BBC drama series Return to Cranford (2009). In 2007, he joined a list of British actors, including Kate Winslet and Orlando Bloom, to have guest starred in the long - running medical drama Casualty . </P> <P> Hiddleston is well known for his portrayal of Loki in the 2011 Marvel Studios film Thor . He was invited to audition by Kenneth Branagh, the film's director, after having previously worked with Branagh on Ivanov and Wallander . Hiddleston said of Branagh, "Ken has had a life - changing effect . He was able to say to the executives,' Trust me on this, you can cast Tom and he will deliver' . It was massive and it's completely changed the course of what is available to me to do . Ken gave me my break ." In the beginning, he originally auditioned for the part of Thor . "I initially auditioned to play Thor . That was what I was being considered for, because I'm tall and blonde and classically trained, and that seemed to be the mold for what Thor was, he was to be a classical character . And it was in my auditions . I owe this entirely to Marvel and their open - mindedness, they saw something that they thought was interesting . They saw some temperament that they liked ." The casting director gave Hiddleston six weeks to bulk up, so he went on a strict diet and gained twenty pounds of muscle . In the end, Branagh decided he was more suitable as the antagonist and cast him as Loki . The film magazine Empire ranked Hiddleston's portrayal as Loki the 19th Greatest Movie Character of All Time . </P> <P> In November 2010, Hiddleston appeared with Benedict Cumberbatch, Gemma Arterton, Eddie Redmayne and Rose Byrne among others in Danny Boyle's one time production of The Children's Monologues, in which he played Prudence, a young girl upset with her mother for her father leaving and excited for her birthday . The play was a one time event of adapted stories of children's first - hand experiences in South Africa being re-interpreted by and performed by various actors . </P>

Who is the actor who plays loki in thor
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