Stargate: SG-1 - Window of Opportunity
This sixth season episode has Colonel Jack O'Neill (two l's) and Teal'c repeating the same six-ten hour window over and over and... you get the idea. The rest of the team is unaware of the loop so it's left to them to figure it out. Meaning, they have to figure out to concisely summarize what's going on so that Major Carter and Dr. Jackson can break the loop. It's all caused by Ancient technology. At least some of the footage was unscripted because director Peter DeLuise was trying to make sure they had enough to fill 40 minutes. The humorous episode became a fan favorite. Continuous loops get boring after a while, so Jack and Teal'c find ways to fill the repeating time. I mean, how often do you get to see them golfing through the Stargate?
Buffy the Vampire Slayer - Life Serial
The mastermind trio of Jonathan, Warren, and Andrew decide to test Buffy's skills. It's the sixth season, and Buffy's graduated high school. She's trying to figure out what to do next. While she try's out various jobs, the team cast spells on her. One of the spells speeds up time, another one summons a demon, and the last one puts Buffy in a time loop. And of course the time loop coincides with her job at the magic shop. She has to deal with a cursed mummy hand repeatedly.
Star Trek: The Next Generaton - Cause and Effect
The entire Enterprise gets stuck in a loop in this fifth season episode. I'm pretty amazed they waited that long to pull this trick out. Each loop results in a collision with another ship; the crash destroys the Enterprise. Though the crew experiences déjà vu, it takes them a few times through to realize that something odd is going on. After 17 days of repeating the loop, the crew figures out the answer. They use Data's programming to get information to them in the next loop, and eventually they avoid hitting the other ship. It turns out to be a Federation ship that has been missing for a long time.
Supernatural - Mystery Spot
Did you ever think you could get tired of hearing Asia's "Heat of the Moment?" If not, watch this third season episode of Supernatural. You'll be over it after just a few time loops. Sam and Dean are both stuck reliving the same day, but only Sam is aware of it. The loop ends when Dean dies, and it starts all over. Sam has to watch it at least a hundred times. It sounds heavy, and it is - but there are some funny moments too. A demi-god is responsible for pulling the strings. Boredom contributed to his puppeteering, but he was also trying to teach Sam a valuable lesson.