With the happy couple seeming to be enjoying an ordinary life, Vincent thinks the timing might finally be right to pop the question until Cat stumbles on an extraordinary case with the FBI involving somebody who goes on a superhuman rampage. Though reluctant to engage with the case for fear of losing the normality he has found, Vincent finds himself with no other options when Cat is injured after discovering that someone is drugging innocent victims and transforming them into super-humans. Meanwhile, Tess accuses JT of stalling his recovery as he tries to understand how he's still alive.

When two married agents (guest stars Alan Van Sprang and Natasha Henstridge) from the FBI take over an investigation, Cat and Vincent hope they are seeing a future version of themselves but fear their work schedules are jeopardizing their relationship. When the two couples bond and team up on the case, a mysterious coincidence surfaces that raises suspicions. JT investigates whether he has super powers of his own while Tess considers a career move. Meanwhile, Heather offers up an interesting option to make her big sister's life a little easier.