

Each episode involves performers walking through a door into an unknown situation, greeted by the line "Thank God you're here!". They then had to improvise their way through the scene. At the end of each episode a winner was announced.
Season 1
10 Episodes · 2006-04-05
Season 2
10 Episodes · 2006-09-06
Season 3
11 Episodes · 2007-07-11
Season 4
10 Episodes · 2009-04-29

Season 5
8 Episodes · 2023-08-02
Season 6
10 Episodes · 2024-08-14
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Whose Line Is It Anyway?