Why TV Shows Do "Crossover" Episodes

A "crossover" is when characters from one series/property appear in an unrelated series/property. In comic books, the "shared universe" idea is so intrinsic, characters regularly guest star in each other's magazines. There are different reasons for doing a TV crossover. The first is just for the fun of it.

LOOK: 'Degrassi Stars Now

Re-watching Canadian TV classic "Degrassi: The Next Generation", which is on its 13th season, brings back so many memories: Teen angst, ridiculous plot points and of course, the hilarious and question...