I just want to clear something up. I'm asking for examples of episodes that were released in two different Complete Season DVD collections. I know it's not really the same thing as being part of two different series, so perhaps I should've given this thread a better title.
By the way, I really hate the website poobala.com/crossoverlist.html. The guy considers the slightest cameo or name-drop to be a crossover and makes the ridiculous assertion that if two shows have one crossover they must exist in the same universe. IMO, there should be at least two crossovers.
Yes, of course, it all makes sense. TWO crossovers, that's the ticket.
Catholics and Protestants kill each other over less....