A stampede at a comic book convention leads to an influx of colorful characters in the ER; Mark continues to make life difficult for Jackson; Ben returns and realizes Bailey has moved on.
Ellen Pompeo
Meredith Grey
Chandra Wilson
Miranda Bailey
Sandra Oh
Cristina Yang
Justin Chambers
Alex Karev
James Pickens Jr.
Richard Webber
Patrick Dempsey
Derek Shepherd
Kevin McKidd
Owen Hunt
Kim Raver
Teddy Altman
Sara Ramirez
Callie Torres
Jessica Capshaw
Arizona Robbins
Jason George
Ben Warren
Nicole Cummins-Rubio
Paramedic Nicole
Daniel Sunjata
Eli Lloyd
Denice Sealy
Nurse
Todd Buonopane
Greg
Matt Doherty
Carter
Jeremy Howard
Keith Hitchens
Jayden Lund
Hulking Patient
Kosha Patel
Tia
Brie Eley
Hospital Administrator
Gordon James
Nurse Gregory
