Ancient terran legends told of a mechanical saviour, one who theorised time travel was possible in his own lifetime and leaped into a primitive quantum portal to save mankind. Rejected by the very folk he came to save, they murdered him for crimes he didn't commit. But as he himself foretold, death alone would not hold him - so if his disciples had a problem, if they could find him, and if they could wait three days, he'd be back.
Blaargh, name that prehistorical religious icon!