What happened between one TV episode or film and the next?

What happened between one TV episode or film and the next?
 How did the characters meet?
 What will happen to them in the future?
 What if the characters from one film or show met characters from another one?  What if the characters were transplanted to another time or place?
 What if two characters became romantically involved?
 What if the point-of-view shifted to a minor character?
 What if the story was told by the antagonist’s point-of-view?  What if the story took place in another genre?
 Zombies. Mutant ants (I’m over zombies).