We've already heard about the flashback episode and how young Richard and Ellis will be featured (which in turn fueled the rumors that Jackson may be their love child).

Well, a new casting call for the episode indicates that younger versions of Meredith's mom and the Chief won't be the only characters featured in this blast from the past:

[YOUNG THATCHER] Male, Caucasian, mid-late 20s, must look like actor Jeff Perry (below).

[YOUNG MEREDITH] Female, Caucasian, six-year-old to look and feel four years old.

What do you think will happen in these flashback scenes? Will they reveal the origins of Mer's dark and twisty side? Or primarily serve to tell Richard's story?

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