A popular variant on the time travel concept is the time loop, where a character relives the same span of time over and over again. Probably the most famous example is Groundhog Day, but TV got a respectable take on it with Day Break. Starring Taye Diggs, the series was cancelled after just a season, which was a major shame. Every day Detective Brett Hopper wakes up at 6:17 AM, is accused of murder, and has to figure out what the hell is going on. The show was remarkably intelligent and had a ton of promise, so it's sad that we only got thirteen episodes.