Martin comes down with a common cold, which is not so common but rather debilitating for Martians. Meanwhile Tim is sent to Trimbles Department Store to review their outer space exhibit. Trimble, a major advertiser in The Sun, tries to buy and bully for a good review, despite the display showing every unfounded stereotype of life on other planets. Tim knows the display to be total fantasy. But he doesn't get a chance to write the review as he inadvertently takes one of Martin's sleep inducing cold tablets and falls asleep. To submit the review by deadline, Martin writes the review based on his own personal experience of what is true to life on Mars. Trimble is livid and wants Mr. Burns to fire Tim unless Tim apologizes and writes a retraction; Mr. Burns is willing to do so. Tim is going to do as Trimble and Burns wants if only to keep his job and keep from financial bankruptcy, but Martin doesn't want him to compromise what he knows to be right and wrong. Tim does stand up to Trimble and Trimble keeps to his threat until Trimble's usually mild mannered daughter, Gloria, takes her cue from Tim's moxie and stands up to her father about the quality of the exhibit. Trimble changes his tune as he admires the stand up quality of his daughter.

Martin reads about a $2 billion American space program, a program he knows is doomed for failure. Not wanting to see the American government waste $2 billion, Tim writes himself a fake letter to the newspaper which includes Martin's nighttime musings; Tim thinks Martin's mumblings are key to the flaw in the space program. Based on the fake letter, Tim writes a newspaper story criticizing the wasted $2 billion. Tim's masquerade is uncovered by the government, agents for whom think he's a spy working for the Russians. Tim is questioned under a lie detector, and he fails miserably when it comes to questions about Martin. So the agents call in Martin, the agents who question him under the lie detector, under hypnosis, and through brainwashing. Martin overcomes each, to him, primitive method. But he can't overcome the truth serum, and he spills the beans about being a Martian. It isn't until then that the agents let Tim and Martin go. They figure that Martin is crazy and delusional, which is causing stress on Tim which in turn made him write the letter.

The stupidest idea Martin has heard of since he's been on Earth: Rosemary Willis leaving her cat, Max, $650,000 in her will. Morton Beanbecker, the lawyer for the estate, is threatening Tim with a lawsuit if he continues to editorialize about the stupidity of the will and deceased Rosemary Willis. However, Beanbecker also mentions that Mrs. Willis wrote a subsequent will leaving her estate to a children's orphanage, that will which was either never signed or hidden. Martin reads his mind that he really wants the second will to be found despite his threatening words to Tim. Tim and Martin find out that Max's trustees are Rosemary's sister, Aggie, and Aggie's husband, Charles. As Aggie and Charles are lavishing money on Max and themselves in the process, Martin and Tim think Aggie and Charles hid the second will. However Max tells Martin himself that he is miserable with all the money, and it was he himself who hid the second will only because Rosemary did forget to sign it. Max leads Martin to the will. Beanbecker and Martin pour through legal books to find precedent to overturn the first will, without success. As Aggie says she hears from Rosemary in her sleep, they decide to hold a séance, where Rosemary - really Martin - will tell Aggie that she wants the money turned over to the orphanage. The ever obliging younger sister Aggie does as she's told.

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.

Martin needs to fly his space ship, which is deteriorating due to inertia. Tim's fear is realized: Martin's flight is spotted as a UFO. Martin needs to take another flight, but Mrs. Brown calls in the authorities - Jack and Jim being their representatives - who use Tim and Martin's apartment as a sighting station. Martin uses the opportunity to take his second flight since Jack and Jim have equipment - a plutron counter - that would be able to locate the space ship parked in the garage. The plutron counter does go off, but Martin slips some plutron into Mrs. Brown's apron pocket, making the plutron counter point in Mrs. Brown's direction. Jack and Jim think the machine has gone haywire. During Jim and Jack's kafuffle with Mrs. Brown, Martin slips away. While in flight, Tim further distracts Jack and Jim with a spoon dangling outside on their tree, which through Jack and Jim's telescope will look like a flying saucer. Martin takes his flight undetected and gets back to the apartment safe and sound. To further protect himself, Martin exposes Tim as the perpetrator of the flying saucer hoax - all in the name of getting a news story - with the spoon on the string as his proof of his claim.

The Earthly environment is causing a vitamin deficiency in Martin. He draws on energy and vitamins from everything and everyone around him. The effect on things is for them to go haywire. And if people look him in the eyes, they will fall asleep since they are sapped of their energy. Martin needs some vitamins immediately or else he will grow weaker and weaker to the point of no return. Luckily, the vitamins he needs can be found at any pharmacy, however by prescription. Also it's Sunday and all the stores are closed. But Tim convinces his good friend, Doc Mullen, to open his pharmacy. Martin's plan is that he will try and get the necessary vitamins while Tim distracts Doc Mullen. It does the trick and Martin starts on the course of his vitamins. However, Martin's illness is contagious and Tim gets it, which in turn causes Mrs. Brown, Doc Mullen and then Martin to fall asleep, with no more vitamins from Martin's stash to use. Thus Tim has to wake them all up without Tim or Martin in particular not to look at each other, as that will cause them both to fall asleep forever. With a lot of effort, Tim and Martin manage to do it as well as get the necessary refill of vitamins from Doc Mullen. Although Martin manages to get re-energized by the concoction, he is over-energized due to a higher than required dose, which in turn causes everyone else around him to feel over-energized. This can be cured by a good old everyday nap.

During an electrical storm, Martin gets an affliction called popsy, which causes him to appear and disappear uncontrollably. With Tim's help, Martin needs to long ground himself electrically to cure the popsy. Just as he does so, Mrs. Brown drops by and accidentally completes the grounding. In doing so, she gets Martin's levitation power. Martin temporarily fixes the symptom of appearing and disappearing by a concoction of household cleaners. But that is only in a need to get his levitation powers back from Mrs. Brown, which requires an electrically charged transfer. With much maneuvering and wiring and some hand holding (to control Mrs. Brown's levitation, but which she construes as Martin being affectionate with her), Martin manages to do the transfer successfully. After that, Martin and Tim need to try the grounding procedure once again. Just as they are about to do it, Mrs. Brown comes by once again, which Martin and Tim think will cause the transfer of the levitation power all over again. But Mrs. Brown fakes them out - this time, she doesn't cause a problem, and Martin's popsy is finally cured.

A toothache of his "eye" tooth causes "eye" problems for Martin: he can't see. Tim takes him to see his dentist, although Martin doesn't have typical human teeth. He needs dental expertise and some dental powder without the dentist actually examining him, which is why dentist-phobic Tim takes the place in the dental chair. The remedy causes Martin's eye teeth to go crossed eyed, as does his vision. The only answer is tooth extraction.

Despite Martin's warning, Tim brings an ESP expert home.

A rainmaker offers his services during a dry spell.

Despite warnings, Tim touches Martin's antennae and disappears.