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Victor Garber is heading to The Big C.

The Alias and Eli Stone actor, who currently co-stars on Web Therapy, will make a guest appearance in the third season premiere. He'll play a foil for Sean (John Benjamin Hickey) after an accidental phone call turns into a harassment situation.

Showtime sets premiere dates for Nurse Jackie, The Big C and The Borgias

The last we saw of Cathy (Laura Linney), she had finished running a marathon, only to learn that Paul (Oliver Platt), who suffered a possible heart attack, may have died.

The Big C returns April 8 on Showtime.