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There were three Thor films.
Chris Hemsworth says his contract is up after Avengers 4 but he is open to maybe playing Thor again in a fourth Thor film.
A trailer for Thor 2 was released to youtube on 4/22/2013
Yes. The didact from halo 4 similar in power as Malekith from Thor The Dark World.
Behind the Scenes - 1992 I Thor was released on:
USA: 4 May 2011
Fine Tuned - 2007 The Might Thor 1-4 was released on:
USA: 7 August 2007