Plot summary
Serena and Blair try to join a prestigious sorority, but are thrown for a loop when they learn Juliet is the head of the house. Returning from St. Barts, Georgina finally comes clean about Milo. Not ready to face what he did last spring and in his high school past, Chuck is hesitant about introducing Eva to Lily, Rufus, and Eric. Title reference: The 1995 film The Underneath.
Credits
Adapted from Wikipedia contributors, Gossip Girl season 4. HTML formatting and reference markers removed.