What is the biggest reunion available?

Question

I am watching "MASH 30th reunion" and there are very few people (i'm amazed) not still around. even the colonel (or whatever rank he was) is still alive.

But what show if all the casts were still alive would have the biggest reunion?

well if they had a major role or continuing role.

Answer 1

original cast? just primary characters? all guests and cameos?