Two familiar faces are about to be admitted to Seattle Grace Hospital. TV Guide has learned exclusively that Catherine Dent, who played The Shield's pregnant cop Danny, and Michael Boatman, the mayor's minority-affairs assistant on Spin City, will both appear in an episode of Grey's Anatomy airing this spring.

In other casting news:

" As part of his new TVGuide.com Q&A, Smallville's Al Gough confirms a visit from Wonder Woman herself, Lynda Carter.

" Megan Mullally guests on Boston Legal later this season, playing a former lover and coworker of Alan's.