An ex-soldier ventures into the Pacific Northwest to uncover the truth behind his fiance's disappearance.

Olivia Barron, her best friend Markie Cameron, Markie's boyfriend Lucas Moreno, along with Penelope Amari and her boyfriend Tyson Curran, and Brad Chang go on a trip to Rosarito, Mexico. In Mexico, Olivia runs into fellow student Ronnie who proceeds to harass her until a man intervenes on her behalf. The man introduces himself as Carter and eventually convinces her and her friends to join him for drinks at the ruins of a mission. There, Carter initiates a game of Truth or Dare with Olivia and her friends, plus Ronnie, who followed the group. Eventually, the game ends when Carter reveals that he deceived Olivia as a means of tricking her and her friends to the mission to offer them in his place in the supernatural game of Truth or Dare. As Carter leaves, he explains to Olivia that the game will follow them and they must not refuse it..

In the aftermath of Captain America: Civil War (2016), Scott Lang grapples with the consequences of his choices as both a superhero and a father. As he struggles to rebalance his home life with his responsibilities as Ant-Man, he's confronted by Hope van Dyne and Dr. Hank Pym with an urgent new mission. Scott must once again put on the suit and learn to fight alongside The Wasp as the team works together to uncover secrets from their past.