On the heels of the announcement that Taye Diggs will guest-star on a special two-hour episode of Grey's Anatomy airing later this season and likely serving as the launching pad for a spin-off fronted by Kate Walsh's Addison, here is news that Hector Elizondo is also paying a visit to the hit ABC drama. An Emmy winner during his run as a Chicago Hope doc (and a big reason why Edward ended up with Vivian), Elizondo will play Callie's father.