<Li> Jaimie Alexander as Sif: An Asgardian warrior, Thor's childhood friend and Jane Foster's romantic rival, based on the deity of the same name . Alexander said there is more character development for Sif and the film explores the Sif - Thor relationship . Alexander elaborated, "I really tried to bring a little bit more vulnerability in this film . Sif is very much in love with Thor and very much cares about his well - being . So she kicks a lot of butt in this movie but she also opens her heart a lot ." Alexander suffered a severe back injury while on the set . About the injury, she said, "It was raining, it was dark outside, it was like 5 in the morning--and I went down a metal staircase and slipped and slipped a disc in my thoracic spine and chipped 11 of my vertebrae . I knocked my left shoulder out of place and tore my rhomboid on my right side...It took me out of filming for a month". </Li> <Li> Rene Russo as Frigga: The wife of Odin, queen of Asgard, mother of Thor and adoptive mother of Loki, based on the mythological deity of the same name . Russo said that her role was expanded and explores Frigga's relationship with Loki, "You know, they cut me (down) in the first film . Kenneth Branagh sent me a nice note, because he understood, he's an actor . You move on, what are you going to do? But I think they're going to need a good mom in the next film . Loki needs his mom . I have a lot of compassion for (Loki). But we might have to have a conversation about what he just did". </Li> <P> Additionally, Alice Krige portrays Eir, an Asgardian physician . Chris O'Dowd was cast as Richard, a suitor of Jane Foster's . Benicio del Toro, who plays the Collector in Marvel Studios' Guardians of the Galaxy, appears in a mid-credits scene with Ophelia Lovibond, who plays his aide Carina . Jonathan Howard plays Ian Boothby, Darcy's intern . Tony Curran plays Bor, Odin's father, based on the deity of the same name . Clive Russell plays Tyr, based on the deity of the same name . Richard Brake portrays a captain in the Einherjar . Chris Evans makes an uncredited cameo appearance as Loki masquerading as Captain America, while Thor co-creator Stan Lee makes a cameo appearance as a patient in a mental ward . </P> <P>--Alan Taylor, director of Thor: The Dark World and several episodes of Game of Thrones </P>

Who played the collector in thor dark world