Question of the Day - What is your ideal TV Crossover Episode?

Welcome to another Question of the Day. Today's question comes from Leonie1988 who asks

"What is your ideal TV Crossover Episode?"

From Leonie

"Crossovers have been done many times, in small ways. It's mostly one character or two who visit the other show.

If you could put together an ultimate crossover extravaganza with three or four shows (cancelled or present), which would it be and why?

I would throw together NCIS with Weeds and The Pretender.

The NCIS team could chase the Botwins and Jarod could pose as a drug dealer. Miss Parker could try to bribe Nancy into telling her were Jarod is, while also being chased by NCIS. Oh that would be great! Though it would have to be three hours long at least."

Great question Leonie!

There are so many I can think of. X-Files/Fringe, Heroes/Sarah Connor, LOST/Chuck but I think I'd have to go with something like Fringe and Dollhouse.

So what about you, what would your ideal TV Crossover be? Which shows and why, and what can you think of for a plotline?

Get creative and sound off in the comments.

And please keep submitting your Questions of the Day Below using the form.

You can see previous Questions of the Day here.

Thanks for all your suggestions and questions that you have been submitting, I try to pick out ones that I find interesting myself and that I think you'd all enjoy discussing. If I have not used one of yours yet, don't worry, it maybe tomorrows QOD!.