The World Series of Blackjack is a televised blackjack tournament created and produced by the cable network GSN. It is a closed tournament; players are either invited to play or can attempt to win a spot via a satellite tournament. Rounds are edited into 1-hour episodes and broadcast on GSN. Matt Vasgersian and Max Rubin provided commentary for the first two seasons. The third season began airing weekly on June 5, 2006 as part of GSN's Casino Night programming block, with new hosts John Fugelsang and Ben Mezrich. Season 4 premiered on GSN on June 4, 2007. A field of 40 players, including Celebrity Blackjack champion Caroline Rhea, baseball star Orel Hershiser and magician Penn Jillette competed for a $1 million prize pool. Vasgersian returned as commentator.