The increasingly manic-mannered David takes Valerie, Steve and Clare for a wild weekend to Las Vegas where his increased drinking and gambling threaten to turn the events bad, and Ray Pruit is performing at their hotel. David ends up picking up two prostitutes and takes them to a seedy motel where they drug and rob him. David is forced to call Donna for help who arrives in Vegas to comfort him. She yells at Steve, Clare, and Valerie for letting David get out of control. Meanwhile, Kelly finally asks Mark to spend the night with her. Also, Brandon befriends Melanie, a diminutive young woman passing through town and who gives him advice on his future career.