Grey's Anatomy is known for its interesting guest roles, but we've never seen one quite like the newest casting call for Season 9.

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E! reports that the show is looking to cast another doctor (not a surprise), in his "late 40s" (sure), who will appear in three episodes (pretty standard).

But here's the catch: Apparently we will only ever hear his voice — we won't actually see him. For three episodes!

Weird, right? Do you have any theories about what part he could be playing? Share your thoughts in the comments below.

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Catch the next new episode of Grey’s Anatomy on Thursday, November 29 at 9 p.m. ET/PT on ABC.

Source: E!

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