Uncle Martin, packed in a tiny bottle, is bound for the Middle East.

There is dual girl trouble in the O'Hara household. George, the dog who Tim is looking after for Mr. Burns, is in love with Chloe, the dog from next door. Through trying to get George and Chloe together, Tim falls for Chloe's owner, Marsha Carson. However Marsha has had some recent relationship problems of her own. Howard Loomis, her boyfriend, took off to Mexico without as much as a goodbye. Because Marsha feels betrayed by Howard, she is now overprotective of Chloe and suspicious of all men, including Tim. Tim's case is not helped by Angela, who bad mouths Tim to Marsha solely because Angela has a crush on Tim herself. From information from Chloe, Martin finds out the whereabouts of Howard, who rushes back to Los Angeles based on "anonymous" information provided by Martin. Howard, whose departure to Mexico was beyond his control and who tried to contact Marsha prior to his departure, clears the air with her and reignites their relationship to the point of getting engaged. This leaves Tim out in the cold. But at least all works out for George and Chloe, as Tim is given the task of sitting for Chloe while Marsha and Howard rush off to Las Vegas to get married.

A rabbit eats a Martian vitamin pill and becomes 6 feet tall.

Martin finds that he is prematurely aging due to the increased gravity on Earth compared to Mars. Thus he goes through some anti-gravity therapy, which in turn causes havoc for those around him.

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.

Martin rocks the music world with his folk singing.

In the desert, a gun-wielding camper spots Tim and Martin working on the spaceship.

Since Tim is unavailable for an outing, Martin asks Mrs. Brown out on a "date". Mrs. Brown herself can't make it since surprisingly she already has a date for that evening. Martin feels dejected, but he doesn't know why. Tim lets him know that he is jealous of Mrs. Brown's new suitor, Andre Philippe Charles Dupre, a suave, debonair fashion designer. On first glance, Martin must admit that Andre is a charming and accomplished gentlemen, worthy of Mrs. Brown's affections. But Martin digs a little deeper in hopes of finding fault with Andre. When Martin finds nothing, he feels ashamed about his selfishness, and vows to further the happiness of Mrs. Brown, a person for who he has deep affection, by doing whatever he can to foster her relationship with Andre. Martin does this despite gleaning from reading her mind that Mrs. Brown does not find Andre to be as romantic a suitor as she had hoped. Thus while Mrs. Brown and Andre are on a dinner date, Martin does whatever he can to make Andre appear the most romantic of suitors. Andre proposes, but Mrs. Brown turns him down and decides not to see him again. She felt the evening was too perfect and thus their relationship would have no where to go. She mentions to Tim and Martin that women prefer men with a few imperfections, she implying that Martin is that man for her.

Martin can't work on his spaceship because neighborhood boy, won't leave him alone. Martin is so stressed that his antennae get stuck in the up position and he loses some of his powers.

Tim and Mr. Burns' nephew, Freddie Carson, are in the running for promotion to journeyman reporter at the newspaper. After finding out that Mr. Burns is a gourmet, Martin decides that a way to swing the tide in Tim's favor is to cook Mr. Burns a special meal, one which includes some special Martian condiments. The Martian ingredients however react with the Earth ingredients to cause Mr. Burns to move in slow motion. The effect of the antidote Martin has on hand has the opposite effect of speeding up Mr. Burns' movements. Meanwhile, Freddie arrives on the scene to take Mr. Burns to the airport to meet a newspaper bigwig. Tim and Martin hide Mr. Burns in his catatonic state in the bedroom while Martin works on figuring out the correct antidote to cure Mr. Burns. Freddie, unaware that his uncle is there, shoots himself in the foot in the quest for what he feels is the sure promotion for himself with some disparaging remarks about a certain uncle.

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.

Something is causing Martin's metabolism to go haywire. In succession, he loses control of his levitation finger, he magnetizes his clothing, he levitates, he becomes electrically charged, he shrinks and then he disappears. He finds out the cause is an increased activity of sunspots, and on Earth there is no way to control their effects on Martians. After five days, the sunspots are still occurring and Martin is still invisible. The authorities, based on a recent insurance policy Mrs. Brown sold Martin with Tim as beneficiary, suspect that Martin's "disappearance" is due to Tim killing him for the insurance money. Circumstantial evidence points in that direction. Martin can't let Tim go to jail for this, and Martin decides to tell the authorities the truth about his Martian identity. Just then, the sunspots cease and Martin reappears, just in time to save Tim and protect his own identity.

Martin convinces Tim to use his connections as a reporter to get Martin a tryout as the astronaut for a Mars destined rocket, privately financed by Omar M. Keck. Despite a slew of younger stereotypical astronaut types vying for the job, Martin's obvious advantages as a Martian get him the job. Before Martin is ready to leave, he allows Tim to prepare a story of his uncle "The Martian" for publication after Martin is on his way. On his way to the air force base with Martin, Tim leaves the tape of the story on Mr. Burns' desk - based on his usual schedule, Mr. Burns should arrive at the office after Martin and the rocket are safely in space. However the launch of the rocket is delayed, leaving Tim and Martin to rush back to the office to retrieve the tape. They rush back to base to watch the launch happen without Martin in the rocket. At least the launch was picture perfect!

Tim gets mad at Martin for "disappearing and spying" on him while he has a date at the apartment. To make up for this, Martin covers for Tim when he goes missing from the office and Mr. Burns calls the apartment looking for him. Martin goes on the story in his place and phones back to Mr. Burns with an exclusive using Tim's voice. Unfortunately, Mr. Burns sees Tim in the office when he is also on the talking to him on the phone; Tim confesses that it is Martin on the phone covering for him. Also unfortunately, the exclusive is regarding an old friend of Mr. Burns', Ambassodor Lloyd Thomas, who decides to sue the paper for invasion of privacy because of the story. Martin finds out that the suit is in part due to some old animosity between Mr. Burns and Ambassador Thomas, and thus Martin decides to try and mend some old wounds.

A rainmaker offers his services during a dry spell.

Tim's great-uncle demands to know where Martin fits on the family tree.

Martin's invisibility mechanism goes haywire everything he touches disappears.

Tim tampers with history when he goes back in time and talks the Indians out of selling Manhattan.

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.

Tim is pursuing who seems to be the unattainable Cynthia Parker. Through reading her mind, Martin finds out that Cynthia is passionate about the classical arts whether it be music, literature or art, and she figures Tim is not, which is the truth. However Tim becomes everything she wants in a man. However this façade Tim fears is hurting Cynthia. Rather than hurt her by telling her the truth, he decides the best option is to find her her dream man. To do so, Martin needs to read men's minds to match them up to Cynthia's. Scanning through Tim's office, they find one perfect match: Bill Fisher. As perfect as Bill would be, there is one catch: he is already seeing someone he nicknames "Angel Face". Peggy Collins, aka Angel Face, is however as well suited to Bill as Cynthia is to Tim. As a matter of fact, Peggy is better suited to Tim and Cynthia to Bill. At a concert that evening at which all four are scheduled to attend, Martin does a little levitation of tickets so that Bill and Cynthia sit together and Peggy and Tim sit together. Each respective pair hit it off. A month later, Bill and Cynthia get married. Things for Peggy and Tim are also going well, however Tim is a bit freaked when Peggy catches Cynthia's wedding bouquet.

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.

Martin's thrift lessons turn Mrs. Brown into a miser.

The time machine takes Tim and Martin back to 13th-century England.

Pete Dudley, a real estate salesman, convinces Mrs. Brown that she should sell her ramshackle of a house, which causes a problem for Tim and Martin, especially in hiding the spaceship. Dudley already has prospective buyers, Edgar and Emily Graham, who would be especially interested in the garage since Mr. Graham wants to make it into a workshop. When the Graham's show up unexpectedly for their first visit, Martin has to hide the spaceship. The only thing he can do is to levitate it with his levitation finger, which even for Martin is difficult due to the ship's large size. They manage to hide the ship long enough for the Graham's visit. Dudley makes Mrs. Brown sign a contract for a $100 advance in commission. After doing so, Mrs. Brown is having second thoughts about selling the house. Martin decides the best avenue to take would be to show the Grahams and Dudley just how ramshackle of a house it is, which he does of course with a little help of his Martian powers. As such, Dudley not only loses the sale, but the Grahams as clients. Martin also gets Mrs. Brown's $100 back for her. And as for Dudley, he decides to leave the real estate game due to some frayed nerves.

Martin needs to electrically charge himself for his trip back to Mars. However he overcharges himself. He needs to rid himself of the excess electricity, and when he initially tries to discharge it, he blacks out half of Los Angeles. Martin is facing two problems. First, if he is overcharged for an extended period of time, he will exhibit unusual symptoms such as a plaid designed face. A current symptom is his continual sneezing which is causing electrical switches to turn on. And second, the power company is narrowing the source of the blackout to the O'Hara's neighborhood, and have called in the police to investigate the malicious tampering with the power grid. Martin figures the best course of action to discharge the electricity in a hurry is to do it direct at the source: the power house. In his invisible state, Martin hitches ride in the power truck that's come to investigate their neighborhood. After distracting the power man on duty, Martin manages to discharge his excess electricity safely back into the system. But once again, he's missed his opportunity to get back to Mars.