After "No Good at Saying Sorry" at 8 p.m., Grey's Anatomy returns at 9 p.m. this evening with another episode - the series' 100th, and one of our all-time favorites.

In "What a Difference a Day Makes," Denny reappeared once again and a selfless Derek, Meredith and Bailey made sure we got to see the dream wedding - Izzie's.

With Cristina as the maid of honor, Meredith as the best man, and George helping his ailing BFF down the aisle, Izzie and Alex tied the knot in a tearful ceremony.

Sure, we might have liked to see Meredith and Derek tie the knot like that, but maybe we still will someday, and the nuptials of Alex and Izzie were just wonderful.

Follow the link to read our episode guide. We also have great collections Grey's Anatomy videos and pictures from the episode, as well as music and quotes. Enjoy!

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