In The Butterfly Effect 3: Revelations, a man named Sam Reide possesses the ability to travel through time by reading the personal belongings of someone who died at a specific moment. When he discovers a diary that details a string of murders, he goes back in time to prevent them. As he delves deeper into the case, he realizes that the killer is always one step ahead of him, leading him to question his own sanity and how he is connected to the murders. With the lives of innocent people at stake, Sam must find a way to save them before it's too late.

Evan Treborn, who suffers from blackouts, discovers a way to remember these lost memories and alter his life by reading his journal. As he travels back in time and makes changes, he faces consequences that affect his present life. Evan's main goal is to save his childhood sweetheart from being molested by her father and tormented by her brother. However, he soon realizes that his attempts to alter the past only lead to unforeseen consequences. Eventually, he decides to scare his childhood sweetheart away and destroy all his memories to save her life. The film ends with Evan and his childhood sweetheart crossing paths after he successfully saves her life.

The Butterfly Effect 2 is a drama, sci-fi, and thriller movie released in 2006. The story revolves around a man who discovers that he can travel back in time and alter past events. However, every change he makes in the past has unforeseen consequences in the present. As he tries to fix things, he realizes that time travel comes at a cost, and he must make difficult choices to save the people he loves.