"Guess What Happened on the Way to the Moon?" is the first episode to put Tony and Roger through a survival mission, this one through a desert locale known as Skull Flats. Jeannie is forbidden from going along but sneaks into her master's water canteen. Despite his protests, Jeannie is able to nurse her injured master, whether chicken soup inside a tent, or roast lamb on the desert, Roger seeing Jeannie in all her Arabian splendor, wondering if he's cracking up. Dr. Bellows marvels how Captain Nelson could gain five pounds without food, and suffer saddle sores walking without shoes! In turn, Roger (still not privy to Jeannie's identity) wonders how his buddy can come up with the same mirages that he saw. This episode's one shot general is played by Byron Morrow.