Credit: Richard Cartwright/ABC Photo: Grey's Anatomy Season 10, Episode 11: Jackson Avery

It's the penultimate Grey's Anatomy installment of 2013, folks! Here's all that we know about Season 10, Episode 11 — "Man on the Moon" — airing December 5, 2013.

Official Synopsis

ABC describes the episode thusly:

"April's [Sarah Drew] sisters arrive to help celebrate April’s upcoming nuptials and quickly get on her nerves. Matthew [Justin Bruening] and Jackson [Jesse Williams] are forced to work together when they witness a terrible accident, Callie [Sara Ramirez] and Arizona [Jessica Capshaw] work hard to reestablish their relationship and Cristina [Sandra Oh] is pressured to live-stream an upcoming surgery. Meanwhile, a familiar face returns to the hospital, on Grey’s Anatomy."

April's Wedding Prep

The Kepner sisters are in full force in preparation for April's big day: her wedding to Matthew. Check out the awkwardness that happens when Jackson pops up at their brunch with Matthew there, and then read about the redheads who will play April's sibs here! Also, if Jackson and Matthew will witness some sort of accident, we're guessing that'll happen at that same fateful brunch.

And speaking of bridal affairs, April's hosting her bridal shower at the hospital — and the Grey Sloan docs are bringing gifts both boring and naughty!

Callie and Arizona Get Closer

Looks like the Calzona marriage could be getting back to normal after all the drama over the past two seasons. Check out the love in Callie's eyes as she beams at Arizona in this photo!

Alex's Dad Is Back and Jonesing for a Reunion

Jimmy Evans, Alex's (Justin Chambers) estranged and once-abusive father, is back at the hospital because he's chosen to finally kick his addictions… likely after realizing that the scruffy underdog of a doctor who was hanging out with him in and out of the hospital is, gee, his son.

Dan Clarendon is an assistant editor at Wetpaint Entertainment. Follow him on Twitter and Google+!