The recently canceled ‘Medium’ returns to CBS tonight at 8pm to begin its final run of new episodes.

The first new episode, “Only Half Lucky”, guest-stars David Arquette (star Patricia Arquette’s real-life brother) as Allison’s brother Michael Benoit. In the episode, Allison has a dream that makes her suspicious of her brother’s recent success, and Devalos’ campaign manager becomes interested in Bridgette’s psychic abilities. The role of Michael was originally played by Ryan Hurst.

CBS picked up the series last year after NBC canceled it, but the network recently decided not to pick up additional episodes for this season. ‘Medium’ will air its final episode on Friday 1/21/11.