Starting off (*ahem* please take one copy of the syllabus and pass the rest down the row), I figure there are three basic plots that can happen in a time travel episode:
1) Our people travel to the past/future, wear costumes & have shenanigans!
2) Someone from the past/future (usually the future) visits us to have shenanigans in our time.
3) An outside force, an accident, or magical science somehow alters the past, usually destroying all we hold dear, with Our Heroes being the last line of defense between us and OBLIVION.
The Temporal Cold War, or whaaaaa I'm watching Enterprise and I think I need a calculator and WHERE DID THE ALIEN NAZIS COME FROM (spoiler!), is mostly #2, which is problematic because people from the future are often assholes. My first task in my Time Travel Marathon (Chronithon? y/n?) is to figure out what the heck happens in this bizaaaarre plot arc!
Enterprise, Season 1:
Makeouts in the pilot episode! Bless.
OKAY! There's barely any time travel in this episode at all, but the Temporal Cold War is introduced, and it's the pilot and it's fabulous so of course I'm going to watch it. Key players are introduced! Like Captain Archer, seen above getting his integrity evaluated (no really, that was the excuse) by a secret Suliban named Serin. He has no clue at this point that he is somehow the temporal lynchpin of the universe. Other weavers of this nonsensical tapestry:
Keckler at twop named this guy Temporal Shower Man and I can't think of him as anything else (the producers apparently call him "future guy" which, come on now, this is a TEMPORAL COLD WAR and EVERYBODY is from the future, let's try to be a little more specific). Temporal Shower Man skypes instructions from the future to The Cabal and wants to destabilize our time and make everyone go to war, or something. Everything near him gets all wavy and timewarpy. He's kind of a royal douchebag.
This is Silik. He's a Suliban. He works for the Cabal. He has freaky genetic enhancements. From what we can tell, he has no real agenda other than to do whatever Temporal Shower Man tells him to do. The way he says Jon is spectacularly creepy and sexy at the same time. DON'T JUDGE ME.
Oh, and that chick the captain was exchanging vital telepathic data with up there?
Oh, and the ship is launched. That's important too. (Other ships that are launched: Trip & T'Pol
Duuuuuude, are you, like, seeing the future right now?
I love first-season Enterprise. They basically bound across the sector going up to alien ships and saying "HI WE'RE FROM EARTH! Whatcha doin'? Can we hang out with you? Want to come see our ship? It's new and goes Warp 5!" This time, they invite some pilgrims on board. One of them is Silik in disguise, and he saves the ship from blowing up. Earlier, Temporal Shower Man stole some of Silik's enhancements (there's a gross scene where other Suliban literally bleed it out of him, showing that the Suliban do whatever this guy wants them to). Why he wants them to save Enterprise is anyone's guess. Temporal Shower Man works in mysterious ways.
We have a new player! Daniels, shown above getting high with Archer using 31st-century technology. He's a human "temporal agent" sent back in time to capture Silik, and he's been masquerading as a steward on the ship. It's pretty much the crappiest assignment ever - he spends four and a half months as a waiter, hanging out with a crew who spends their movie nights watching Night of the Killer Androids, and then Silik "kills" him. At least the Star Trek Rules of Time Travel specifically state that a dead time traveler is probably not really dead. Archer nonsensically orders Daniels' quarters locked up with the mysterious future stuff still inside, while foreshadowing music plays to the tune of I'll bet this will be relevant again in the season finale cliffhanger.
And this has nothing to do with time travel, but Malcolm, Hoshi and Travis have ACTUAL SCENES with ACTUAL LINES and there's some serious adorable while Hoshi and Travis wonder aloud what it's like to sit in the captain's chair and it's so cute I might die:
(I ship them so hard.)
Archer: Thinks time travel is probably legit because you can just trust someone who makes your scrambled eggs right.
Trip: Is completely sold on anything that lets him play with cool tech.
T'Pol: The Vulcan Science Directorate has found no evidence that time travel is possible.
Temporal Shower Man: Douchebag.
Silik: Still giving off weird sexual overtones at Archer.
Daniels: Dead (maybe).