Just slow it down, I'll shoot Hitler out the window... Darn! I hit Eleanor Roosevelt by mistake!

John Titor returns

That's because another time traveler was sent by the bad guys to stop him. But then another time traveler was sent to stop that dude. But he tripped up the first time traveler by accident. So the good guys sent another time traveler to stop their own man from messing up the original time traveler. But then the bad guys sent a time traveler, but he failed to materialize. So they tried again, but this dude actually caused the previous dude not to materialize. So they sent another to a more remote location, but his car broke down before he could make it. So they spent a lot of time training someone to fix ancient cars, but then when that dude arrived he nerded out too hard because the car they got was really cool. So they sent another, but this one was stopped by another traveler from the good guys. Turned out these dudes knew each other and played both sides to escape their distopian world and live in the past to grow old together.