Third Nacelle wrote:
I'd say that any time travel that doesn't result in MAJOR changes to the timeline is of the predestination variety. Small changes propagate big changes. A butterfly can cause a hurricane. Data's head is buried beneath San Francisco right now, and always has been, because Time's Arrow happened before itself. Same with Sisko as Bell.
Old Spock rescuing Data's head in the alternate reality would be a cool story.
DATA'S SEVERED HEAD: "The events of this era do not match the descriptions in my historical files."
OLD SPOCK: "Yeah... my bad."