Denny Siegel is an American TV personality who was a recurring performer on the American version of Whose Line Is It Anyway? She was known for being a recurring correspondent on The Daily Show with Jon Stewart.
On Whose Line, she was the first female regular on the US version. She was used prominently in the first season, but by the second season she started appearing less, and then disappeared from the show altogether.
As for games she did, she was featured as the bachelorette in Let's Make a Date, and was a frequent host in Party Quirks (though in the episode she did with Greg Proops, she got to be a guest). She got to do Props, and got to narrate in a game of Hey You Down There.