When two popular shows collide...
With a five-minute preview of The Simpsons and Family Guy's crossover episode debuting over the weekend, fans of both shows are becoming more excited than ever before to see the residents of Springfield and Quahog unite.
TV show crossovers are often funny, clever and incredibly crowd-pleasing. But above all, they're big attention-seeking ratings gimmicks that often return big viewing figures.
'The Simpsons Guy' will air on September 28 and marks the hour-long season premiere for Seth Macfarlane's show's 13th run. As the big day draws closer and closer, we've rounded up 9 other big crossovers that set fans' pulses racing and made for major TV events.

The Simpons meet the Griffins this fall (Fox)
Remember when Chandler Bing from Friends popped up on Caroline In The City? No, us neither, but it happened, and it was great. How about when crime shows joined forces for a CSI-meets-Without A Trace amazeathon? Or when the Power Rangers came face-to-face with the Teenage Mutant Ninja Turtles?
Check out our fave crossovers below.
Roseanne Barr had wanted to take charge of a US version of Absolutely Fabulous but it never came to fruition. So instead, she got Jennifer Saunders and Joanna Lumley of the UK original to swing by on her eponymous sitcom.