Ultimate One-Shot Antagonist/Monster - سروے 

Great list except for Meg-possessed Sam. I mean seriously? That was Meg [they say it right there in the description] and she's in no way a one shot character.
Other than that...great list.

But technically she was only in Sam once .. I guess that is their point. O_O Idek. Lol I agree with you :P

Agree, great list, really hard to choose from except for Meg possessed Sam, that was random and not at all one-shot, so it makes no sense to me. I do get that she only possessed Sam once, but still, she's been around a while.

I guess people really like Jared's one-shot Meg episode. Lol he was pretty goodd :)

Eh they probably only added it to balance out the shapeshifter 'Dean' option. That way both the boys are featured...sort of.

Oh! I guess. Good point.