Assimilated

Last fall, Grey’s Anatomy introduced a foursome so polarizing it was only a matter of time until they exited the show.

All four made it through the season, though, but two met their maker during the bulletstastic season finale.

Now, one of the survivors, Dr. Jackson Avery played by the stunning Jesse Williams, is sticking around Seattle Grace for good, long while. The actor has been officially upgraded to series regular.

A deal for fellow Mercy Wester, Dr. April Kepner (Sarah Drew), is being worked on for the show’s seventh season.

Photo: Flixster.com.

Update: A deal for Sarah Drew to join the cast of Grey’s Anatomy full time has been reached.

She better not mean trouble for Meredith and McDreamy.