The late David Carradine has at least six movies in post-production, so we haven’t seen the last of him. And yesterday we caught the first of his post-mortem performances, guest-starring on Fox’s unfortunate new series Mental as a man who’d been struck by lightning. Carradine spent the first 50 minutes of the hour in a wheelchair, disturbingly comatose, until this ridiculously overblown denouement. Not his finest moment. Nor Fox’s.