Eureka: Season 3, Episode 4

3 - 4: I Do Over

On Allison and Stark's wedding day, Sheriff Carter finds himself stuck in a time loop, causing him to experience the same lousy day over and over again. Meanwhile, Sheriff Carter's sister, Lexi, visits Eureka. As the time distortion escalates and threatens the town and entire universe, Carter's team takes desperate measures. Carter tries everything to escape the time loop, he even takes Lexi's advice believing it is stress related and kisses Allison right before she walks down the aisle. Carter finds he is not the only one inside the time loop, but the scientist tries to fix it and dies. Stark saves the day, but sacrifices himself to do so, seeming to dematerialize.