Circle April 30 on your calendar, Grey's Anatomy viewers. That's when a pair of parents pounce!

According to E! Online, both Thatcher Grey and Izzie's mom (guest star Sharon Lawrence, pictured) are scheduled to appear on that date's episode.

Moreover, the two men from Ellis Grey's past (the Chief and Thatcher) will finally throw down... sort of. Also, look for Robbie Stevens to come across an older version of her daughter. She'll be quite chipper, even in the face of Izzie's diagnosis.

Meanwhile, here's an update on the major wedding news fans can't stop buzzing about:

It might not be Meredith and Derek that get married on May 7, but instead Alex and Izzie. Get those tissues ready, readers!

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