Season 6, Episode 5 Invasion

First Aired: October 15, 2009

It's Day 1 of the Seattle Grace-Mercy West merger, and residents react as though their jobs are on the line. They are, especially Izzie's. Meanwhile, Callie's father (Hector Elizondo) gets a priest to urge her to date men. Callie's enraged, and Arizona stands by her.

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