Spoilers

2x18-- Two Ships

• Wesley returns to Palo Alto, again working as a rogue demon hunter.
• Gord finally finds out the secret Connor's been hiding.
• Freema Agyeman makes her first appearance as Grace Kendrick, a Watcher with a secret.

2x19-- Sisters

• A great deal of history of the three Hellgods is revealed.
• Connor has a vision of Holtz during a tense moment.
• The final players of the battle arrive in Palo Alto.

2x20-- Lock and Key

• Dawn finds out about her origins as the Key.
• The Knights of Byzantium appear.
• The good guys have overlooked a vital asset in their possession.