When the NYPD asks the Avengers for help shutting down a massive teenage lake party, Tony, Pepper, Steve, Natasha, Bruce, Clint, Thor, and Loki volunteer, expecting an easy night. Instead, they arrive to complete chaos—fighting, drinking, dancing, skinny-dipping, vandalism, and hundreds of out-of-control teens. While trying to safely shut everything down and get everyone home, the Avengers discover something even worse: Tony's son, Peter Stark, is there. Not only is Peter at the party, he's practically running it alongside his girlfriend, turning what should have been a simple mission into a complete disaster for the Avengers—and especially for Tony and Pepper.