Ariel (Firefly episode)

"Ariel" is the ninth episode of the science fiction television series Firefly, created by Joss Whedon.

Hard up for cash, the crew of the Serenity takes on a job from Simon: break into an Alliance hospital on the central planet of Ariel so Simon can perform a thorough diagnostic of River and the crew can loot the valuable stores of medicine. But River's pursuers are hot on their trail, and they receive some unexpected inside help.