WARNING: If you don't want to know what happened in this episode, don't read this photo recap!
It's the last day of the Blood Drive! Sort of! More like the season finale of the show within the show. Grace and Arthur bond and get SUPER couple-y as Grace tells Arthur about the time she killed a dog that bit her sister, Karma. Pulling into the show, they're excited because Slink has them doing this one last favor.
The final test for the Blood Drive contestants is a fight to the death in a sort of cage match called The Battle Dome. And this guy, the Heart Industries bigwig, shows up to say the finale will be shown in the closed circuit cameras and the Blood Drive is being shut down. Again.
Having left Aki on the side of the road, Christopher blasts toward the Battle Dome, but realizes he can't do it without her, so he heroically turns around and heads back to get her. They're going to get rid of her proximity sensor so they can run off together for good.
Arthur finds himself in the Battle Dome, but has vowed not to kill anyone. That's the whole point of the Dome: battle to the death. He is attacked by everyone. And he holds fast, even giving an impassioned speech and telling the assembled crowd that they're all under arrest.
The Head of Heart Industries tells Arthur that they need him to kill people. For ratings, presumably. This horrible dude has Grace captured and is using her as bait so that Arthur will do what Heart Industries wishes. Then he starts to take his clothes off…
Seems that Karma snapped pretty hard when Grace left her for dead. And this has all been a revenge plot. It's going according to her plan until Slink confronts her, frees Grace, and kicks Karma into the Battle Dome.
And then, the unthinkable. As Grace realizes her sister has snapped permanently and must be dealt with - the two fight hard. The result is Grace FALLING INTO THE CAR! Is she dead!? (Turns out, no. Not a spoiler, someone else fell into the car, but…) Arthur THINKS he's witnessed Grace's death!
After some monologuing and sadness, Grace and Karma have one last epic battle. Grace gets the advantage, and pushes her entire raison d'etre into the car. Make no mistake, this time, gang. Karma. Is. Dead.