From the never-aging men’s club (of which, Rob Lowe is president), Tim Daly will be joining the cast of the hoped-for Grey’s Anatomy spinoff. Daly will appear in the upcoming two-hour Grey’s Anatomy episode that is expected to launch a spinoff featuring Dr. Addison Montgomery (Kate Walsh). Also on board for the new series is Paul Adelstein, who plays Secret Service Special Agent Paul Kellerman on Prison Break. What’s that mean for Prison Break fans? Is the writing on the wall for Agent Kellerman? That’s another story, I suppose. Adlestein did appear in the pilot episode of Grey’s. Sexy Taye Diggs has already signed on for the episode and potential new series. The two-hour extravaganza will put Addison in a position that may have her leaving Seattle Grace. Daly was last seen in the canceled series The Nine.