Six Feet Under shrink Joanna Cassidy has been booked for a three-episode guest-star arc on ABC's Boston Legal, playing a fiftysomething woman on the hunt for a second husband among the firm's partners. Just don't look for Denny to carry her off to bed, at least not literally: William Shatner was taken to the hospital on Tuesday after complaining of lower back pain, but was expected back on the set today.