Marvel Movies have a great collection of epic hero movies.
Chosen movie: Thor: Ragnarok
The Epic Hero: Loki
this is a short summary
Stage 1: Thor is fighting evil guys and Loki is posing as Odin and enjoying the life in Asgard.
Stage 2: Thor's sister, Hela, is accidentally awakened from her prison and turns out she was sealed away to prevent her plans to create mass destruction to the kingdom of Asgard.
Stage 3: A fight ensues between Loki, Thor and Hela and Loki abandons Thor in the midst of the fight. Thor is thrust into another planet as exilement.
Stage 4: Thor meets Loki in the Planet of Junk but Loki pretends not to know him and even encourages the King to torture him.
Stage 5 : Loki and Thor eventually escape back to Asgard. Loki pretends to betray Thor and pledge allegiance to Hela.
Stage 6: Just as Hela is about to kill a much weakened Thor, Loki flungs himself forward to protect Thor, and is mortally wounded by Hela.
Analysis: Loki is initially thought to be a villian but he is really acting and sacrifices himself to save his brother.