S01E16 — Rx for Martian

Martin can make it back to Mars since Mars has deviated from its regular orbit temporarily and is thus closer to Earth than usual. Martin has a 10 hour window of opportunity. Just as he is about ready to leave, he slips down the stairs and sprains his ankle, which also sprains his disappearing antenna. Mrs. Brown immediately calls an ambulance to the scene. When the ambulance physician takes Martin's vital signs, they rush him to the hospital since his vital signs aren't "human". The intern at the hospital has the same reaction. Martin knows that to get them to discharge him from the hospital, he needs to appear humanly normal and thus does everything he can to have normal human vital signs. He passes that test, but when the doctor requires a fluoroscope, Martin is worried since the gamma rays from which will make him explode. Tim manages to take the fluoroscope for Martin, but the doctors keep Martin in the hospital to figure out why the fluoroscope shows that he has the body of a 20-year old. With one hour to spare, Martin regains the use of his disappearing antenna and manages to escape from the hospital. Just as he is ready to leave Earth for the second time, Martin slips down the stairs once again and sprains his other ankle. Nothing can help him this time and he misses his opportunity to get home to Mars. But Martin surmises that home is where you hang your hat, and that just happens to be Earth for the time being.