Shep and Mandy are coming up on their fifth anniversary together. They're one of those perfect couples you see on social media, but in reality they seem to not know each other at all anymore. When Mandy tries to finally break up with Shep, they're stunned by an emergency phone alert: BALLISTIC MISSILE INBOUND FOR LOS ANGELES. THIS IS NOT A DRILL. With LA in a panic, Mandy and Shep decide to ride out the crisis at home, and work through everything that is wrong with their relationship.