Chris Hemsworth ( Thor) finds himself in gladiotor contest against his fellow avenger The Mighty Hulk( Mark Ruffalo) . Thor should fight for his freedom to save the asgardian civilization and in the process of this he losts his all time sported stylish long hair??, any way he looked awesome in short hair too. By the way he loses his hammer too. The screenplay , plot and cinematography is excellent and the performance of each and every actor is splendid. The timing of comedy was perfect and especially between the thor and hulk was absolutely funny. The ragnarok is about how thor is going to save his asgardians with the help of his fellow avengers and others from his sister valkyrie( Tessa Thompson)