Yeah, so that last session - I had pulled the characters sheets out of my folder the last time we played, and a year passed, so I forgot I did that - but I did have long-undead Mongo's character sheet still floating around.
"Crap. I forgot the characters. All I've got is an old Mongo."
"I guess I could play him again."
"You can ALL play him."
Gonzo-science-fantasy is a very forgiving genre for D&D.