Following up on reports of Ben having nightly activities, Kevin and Gwen discover what might be described as Ben's evil twin.

When Gwen demands that Kevin take her to her school's summer dance, Ben offers Kevin good advice. Meanwhile, Ben and Julie contend with a malfunctioning Omnitrix and a rogue Big Chill.

When the team turns to Cooper to get Kevin's transporter device working properly, they find their young friend has been abducted. Finding him leads to a well-hidden DNAlien base.