EW Staff
September 10, 2010 AT 04:00 AM EDT

A pair of ”seismic events” will shake up the Dubois family dynamic in Medium‘s seventh season, promises exec producer Glenn Gordon Caron. Eldest daughter Ariel (Sofia Vassilieva) departs for Dartmouth, which prompts Patricia Arquette’s Allison to finish her own long-delayed law degree. ”She’s coming into contact with all these different, interesting people,” says Caron, and that will cause some tension with her husband, Joe (Jake Weber). Also, Detective Scanlon’s (David Cubitt) recently departed brother (Dean Norris) will wreak ghostly havoc, and Medium will lure a special guest star out of retirement: Saturday Night Live‘s Mr. Bill. ”He’ll be meeting some horrible fates,” says Caron of the clay celebrity, who will pop up in one of Allison’s dreams. ”He wouldn’t be Mr. Bill if he didn’t.” SEPT. 24

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