While waiting on the Core planet Ariel, Simon hires the crew to help him smuggle River into a local hospital for a thorough diagnostic. In return, he will tell them how to loot the hospital for valuable medicine. Once inside, Jayne attempts to turn in Simon and River for the reward. However, the Alliance officer arrests Jayne as well in order to keep the bounty for himself. The crew escapes, but Mal realizes that Jayne betrayed Simon and River. Mal arranges for Jayne to suffocate when Serenity leaves the planet's atmosphere, but then lets him live.