What is the name of this show?

[MightySaint]

I'm having a brain fade (been out of Oz for a while). What is the name of the show where they put comedians into unrehearsed situations to play a certain character. 4 comedians in a one hour episode followed by a group skit.
I'll kick myself when i read it, but my mind is completely blank...

[year of the roo]

Whose Line is it Anyway?

[Fwoy]

Thank God You're Here

[ManWithNoName]

Thank God You're Here
^^ Winner.