After her brother is killed in a miscarriage of justice, aspiring inventor Claudette 'CJ' Walker uses her scientific mind to create two time machines, one for her, and the other for her friend Sebastian. As they use the machines to try and alter the day CJ's brother died, they come to learn the ultimatum of time travel: All Actions Have Consequences.
This is a great sleeper movie. It's a little darker than you expect but still a great movie. With a cameo and call out to the greatest time travel movie of all time "Great Scott" this is one I recommend adding to your list to check out.