[s6e5] Invasion -

: The episode was written by Mark Wilding and directed by Tony Phelan .

: Callie Torres faces a personal crisis when her father, Carlos, returns to the hospital with a priest in a misguided attempt to "cure" her bisexuality. [S6E5] Invasion

: Seattle Grace residents are forced to compete for surgeries and equipment with their new rivals. Tensions boil over when Reed Adamson attempts to take George O'Malley's old locker, leading to a confrontation with Izzie Stevens. : The episode was written by Mark Wilding

: Fans often remember this episode for the "dark and twisty" bonding between Cristina Yang and Alex Karev, both of whom seek solace in Meredith's room as they deal with the fallout of the merger. Tensions boil over when Reed Adamson attempts to

The fifth episode of the sixth season of , titled " Invasion ," is a pivotal hour centered on the high-tension merger between Seattle Grace and Mercy West hospitals. Originally aired on October 15, 2009, it marks the introduction of significant new characters and a major departure for a long-time series regular. Plot Summary