Gossip Girl (2007), Save the Last Chance

Serena has gone missing.

Serena hosts a gala to prove herself in adult society.

Blair relies on help from an unlikely source.

Georgina urges Dan to choose a date.

Unexpected emotions arise as Serena volunteers to help Dan.

A close ally reveals Chuck's plan to bring down his father.

Serena and Dan throw their first Thanksgiving together.

Blair is concerned for Chuck's safety and devises a plan.

Gossip Girl's identity is finally revealed.