If you're fired from your job for fighting with the boss or using drugs, it rarely affects anyone outside the family or workplace. But on a successful TV show, an actor quitting or getting fired means his character must move out of town or more likely, dramatically get killed off. Or the producers may get creative, as in the case above. But there was a very important character who continued on after the actor bowed out.
Who knew that one of the main features of the Doctor was born from a practical production reason instead of an existing mythology? But that's why we still have Doctor Who today. See a pictofacts list of TV characters and the reasons they left their shows at Cracked.
I always Google if characters leave by choice or it's in the storyline
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