Lois and Clark are on board the Titanic. Do whatever you want with that. Note: it doesn't have to sink.
Julie
Mulder: Imagine if you could come back and take out five people who had caused you to suffer. Who would they be? Scully: I only get five? Mulder: I remembered your birthday this year, didn't I, Scully?
There is a story with the title 'Mission In Time', where Lois and Clark were on board the Titanic. It hasn't been finished yet, and it's been a long time since SymbolicAngel posted any parts.