Barry Thomas is a bored and frustrated office worker who is going through a mundane routine when he suddenly finds himself in a time loop. He wakes up on the same day, with the same events and conversations around him, only to repeat it again the next day. Barry soon realizes that the time loop is caused by a glitch in a top-secret research project being conducted by his employer, the National Research Institute.
Despite his initial disbelief, Barry eventually accepts the situation and decides to take advantage of it by making changes in his daily routine and improving his life. However, his curiosity and eagerness to explore the time loop soon turn into a task to save Lisa Fredericks, his attractive co-worker with whom he has developed a connection.
Barry discovers that Lisa is the victim of a fatal accident that occurs every time the time loop resets. He tries to convince Lisa and his colleagues of their predicament, but no one believes him. Barry begins to research the project and seeks advice from Dr. Thadius Moxley, the project's lead scientist, who also happens to be the only person who understands the mechanics of the time loop.
Barry's efforts to save Lisa involve a range of tactics, including warning her and trying to alter the sequence of events that lead to her death. Each cycle provides him with an opportunity to perfect his plan until he finally succeeds in saving Lisa and breaking the time loop. In the end, Barry and Lisa start a relationship, and Moxley congratulates him on his bravery and ability to fix the project.