Mare visits a grisly murder scene before informing the victim's enraged father. As a video from the night of the crime surfaces, Mare questions suspects in the case and gives an icy welcome to County Detective Colin Zabel, who's been called in to assist. Later, Mare bumps heads with locals and airs concerns about her grandson Drew in light of her late son's mental health struggles.

Supervillains Harley Quinn, Bloodsport, Peacemaker and a collection of nutty cons at Belle Reve prison join the super-secret, super-shady Task Force X as they are dropped off at the remote, enemy-infused island of Corto Maltese.

It's two firsts for Mark: a first date and a first trip to another planet. At the same time, Nolan and Debbie revisit their own first vacation together.

With Mare forced to take a backseat on the case, Colin presses a local priest about the vague circumstances that prompted his transfer to the parish. Meanwhile, an anonymous call gives Dawn hope that Katie might still be alive.