Officer's Lounge (OOC)
Well, there are some amazing plots from the various TV series it might be fun to try. I should add, I am very much into "future people go back in time and get it wrong" and ST does that well. TOS had mobsters, romans, and such things. I loved the Vulcans back in time episode in Enterprise. And who doesn't love Trials and Tribblations?
(OK, I know the romans and mobsters were not time travel, but cultural contamination, but it still applies, sort of!)