The Gemini 12 was the spaceship used by the Robinson family on their voyage to colonize Alpha Centauri. Upon taking severe damage when it encounters a meteor shower it is unable to avoid, it crash-lands on a different, unknown planet far from the ship's original destination where it is found to be inoperable. ("No Place to Hide")


The Gemini 12 was renamed as the Jupiter 2 in the subsequent episode, "The Reluctant Stowaway".