Newly engaged Seth and Summer both panic about the prospect of being married, but neither will break it off, despite the advice of their friends. Instead, they begin a complicated game of one-upmanship that almost leads them to Las Vegas for a wedding. Meanwhile, when Ryan's estranged biological father, Frank who has been in prison for years, tries to reconcile with Ryan, Sandy remains dubious.

Taylor's ex-husband, Henri-Michel, gets a little too close to home while promoting his erotic memoirs. After Henri-Michel tells Ryan about Taylor's exciting life in France, Ryan questions his own relationship with Taylor. Meanwhile, Seth visits Dr Roberts in Seattle to ask for permission to marry Summer, who gets a vision of her future, and Kaitlin realises that she likes Will, but she is concerned he thinks she's too shallow.

Che and Seth take a trip to a forest, where Che has a dream and discovers that his spirit might be in love with someone unexpected. Afterwards, Seth and Summer finally speak for the first time since she rejected his marriage proposal. Meanwhile, Taylor decides that she can no longer associate with Ryan, Julie works her way back into Kirsten's life in the only way she knows how, and Kaitlin shuts out Will.