VIDEO: Sneak Peek - 'O Brother Where Art Thou' Episode of PRETTY LITTLE LIARS

Charles prepares for a homecoming on his birthdayin "O Brother, Where Art Thou," an all-new episode of ABC Family's hit original series "Pretty Little Liars," airing Tuesday, July 21st (8:00 - 9:00 PM ET/PT). Watch a sneak peek below!

There are mixed emotions in the DiLaurentis household when Charles declares he is coming home for his birthday. Mr. DiLaurentis wants to quickly get out of town to hide Ali and Jason from their brother, while Jason sees this as an opportunity to finally validate all of the early childhood memories he has of "Charlie." The PLLs are just as split with Spencer and Hanna seeing this as the best chance they have to capture Charles, while Emily and Aria want to stay as far from him as possible. Will Jason be reunited with his brother, or is this just another of "A's" traps?

Meanwhile, Mona is shutting Mike out and Hanna gets an unwelcomed surprise.

"Pretty Little Liars" is produced by Alloy Entertainment in association with Warner HORIZON Television and is executive produced by I. Marlene King, Oliver Goldstick, Leslie Morgenstein and Joseph Dougherty. The series stars Troian Bellisario, Ashley Benson, Tyler Blackburn, Lucy Hale, Ian Harding, Laura Leighton, Shay Mitchell, Janel Parrish and Sasha Pieterse.