Karma the superstition is not real, however this is a subjective question.
Some good films relating to karma are:
"Cloud Atlas" (2012) - This science fiction film tells six interconnected stories set across different time periods, with the characters' actions and decisions influencing each other in the past, present, and future. The film explores the idea of reincarnation and the notion that our actions in one life can have consequences in the next.
"The Fountain" (2006) - This visually stunning film tells the story of a man's spiritual journey through three parallel stories set in different time periods. The film explores themes of death, rebirth, and the interconnectedness of all things, as the protagonist grapples with the idea of accepting his own mortality.
"The Adjustment Bureau" (2011) - This science fiction thriller follows a politician who discovers that his life is being controlled by a group of mysterious beings who plan out his every move. The film explores the idea that our choices and actions can have a profound impact on our future, and that we have the power to change our fate through our own decisions and willpower.