[Warning: The following contains spoilers from Thursday's Grey's Anatomy. Read at your own risk!] Teddy (Kim Raver) had a jaw-dropping blast from the past on Thursday's Grey's Anatomy, which not only revealed a part of Teddy's history that fans had no idea existed, but also put her cheating on Owen (Kevin McKidd) with Tom (Greg Germann) in a whole new light.
The heart surgeon was one of the handful of Grey Sloan doctors that went to a surgical conference in Los Angeles, where she ran into a former roommate Claire (Rya Khilstedt).
They lived together in New York with a third roommate, Allison (Sherri Saum), who died in the World Trade Center on September 11th.