We certainly don't have to tell you that Dr. Alex Karev has had his share of romantic dalliances with Seattle Grace staff members in five-plus seasons of Grey's Anatomy.

But do we know about them all?

EW says the upcoming February 18 episode, "Time Warp," will answer this burning question: Which of Seattle Grace’s other female docs has Alex hooked up with in the past?

Any theories? Do you interpret this as we do, that he's gotten with someone and it hasn't been shown on screen? If that's the case, could it be Meredith? Callie? Who?

Chime in below with comments!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.