Have you ever stopped to think about how powerful a TV writer is?

They have the ability to make the Ninja Turtles high five the Power Rangers... to make Urkel give a pep talk to Stephanie Tanner... to make the cast of Gilligan's Island reunite, just to teach Alf a valuable lesson!

Here's a brief timeline of just some of the most ambitious crossovers ever to grace the airwaves:

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