In the electrifying mid-season finale, Pamela's discovery that John Ross has been sleeping with Emma ignites a firestorm at Southfork threatening not only their relationship, but Bobby and Ann's. Christopher and Heather (guest star AnnaLynne McCord) must deal with a drastic action taken by Bo. Elena and Nicolas' relationship is tested as Drew's arrival in Dallas continues to threaten their plans, and Emma takes a page out of her grandmother's playbook that ends in disaster. As cliffhangers build, lives and relationships are brought to the brink, setting the stage for showdown upon showdown.