It’s got a fantastic idea at its core, and it's executed really well—a true science fiction classic. "Source Code" feels like one of many mainstream movies built around a complex concept. It seems popular to create narratives that are deliberately confusing so audiences will label them as brilliant or ingenious, leading people to watch them again because the story is so perplexing. "Inception" is an example of this type of film. This movie surpasses “Inception” in quality but likely won’t receive the same level of recognition. The plot centers on a commuter ("Colter Stevens," portrayed by Jake Gyllenhaal) who experiences an identity crisis while on a train. Before he can figure things out, everyone on board dies in a large explosion. Following this (!), he wakes up in a strange room and is questioned by military personnel about the cause of the blast. This isn't a spoiler; it’s established early that this is what has occurred. Naturally, questions arise like "Which version of reality is genuine?". Accepting the science fiction explanation—which involves clandestine military experiments—gives the scenario a degree of believability and avoids overreaching ambition. There might even be some real science behind it, perhaps speculative, concerning information stored in the brain after death, roughly eight minutes’ worth, which becomes another element of the movie's appeal: the character repeatedly reliving those eight minutes to solve the mystery of the train explosion. The later developments may stretch plausibility, but I simply went along with the premise; it might have been a more convincing story if the filmmakers hadn’t taken that direction, resulting in a more grounded science fiction experience. It's an engaging narrative that seems complete, at least on one level—the filmmakers give you hints about what’s happening and don’t leave you feeling lost like some similar movies do. P.S. Thinking back, the way they handled the 'reliving' of those eight minutes did strike me as a potential plot hole, but I just enjoyed the film at the time. It's an appealing, dark, and somewhat morbid fantasy. If you appreciate this movie, other films and a video game with related themes include: "12 Monkeys," “The Matrix,” “Dark City,” “Groundhog Day,” and "Assassin’s Creed" (the first game in the series isn’t particularly enjoyable to play; the sequel is much better).

Source on TMDB