An unidentified flying object makes an emergency landing on Earth and is taken into custody by the United States government. The occupant of the "flying saucer" turns out to be a strange cat-like alien named Zunar-J-5/9 Doric-4-7. Since the Mother Ship cannot send a rescue party before it leaves the solar system, the cat sets about investigating how to repair the ship himself. Using a special collar that amplifies telekinetic and telepathic abilities, he follows the military to the Energy Research Laboratory (or E.R.L.), where they hope to learn how the UFO's power source works. One of the lab's scientists, Dr. Frank Wilson, attracts the cat's attention when his theory on the power source, while ridiculed by the rest of the staff, is actually on the right track.
The cat follows Frank to his office, where Frank nicknames him Jake. Another scientist, Dr. Liz Bartlet, storms into his office, upset at Frank's sense of humor in light of such an important scientific discovery. Frank is able to calm her down, mostly by introducing Jake and inviting her to dinner. After Liz leaves, Jake reveals his true nature to Frank, demonstrating his abilities and offering to exchange his advanced knowledge on energy for Frank's assistance. That evening, the pair plan to break into the military base where Jake's ship is being kept, but must dodge Liz who has arrived for their date with her own cat, Lucybelle. Jake feigns being sick, allowing them to proceed to the base. At the base, Frank uses a back-up collar to fly to the top of the ship and attach a diagnostic device. Jake learns that he needs an element that he calls "Org 12". When Jake reveals the element's atomic weight, Frank realizes that "Org 12" is the element that humans call gold.
Back at Frank's apartment, Frank tells Jake that an amount of gold costing $120,000 will repair Jake's ship. Dr. Norman Link, a colleague of Frank's, comes over to watch horse races and football games on which he has wagered money. Jake uses his powers to help Link's horse win the race, prompting Jake and Frank to convince Link to help them by parlaying all of his bets to win the money. However, Jake gets knocked out by a well-meaning vet that was brought in by Liz because she thought Jake was still sick. Frank informs Liz of the situation and the group heads to a local pool hall where Link has placed his bets. Learning the last game in the parlay was lost and desperate to raise the money needed, they agree to a game of pool with a hustler named Sarasota Slim. Frank's first attempt to use Jake's collar fails, but Jake regains consciousness in time to manipulate the final game and win the money they need to acquire the gold for Jake's ship.
However, an industrial spy named Stallwood, who works for a master criminal named Olympus, has learned of their activities, as has the military. Frank and Jake manage to elude the military and the criminals, only to have Link, Liz and Lucybelle captured by Olympus and his men. They plan to ransom them back for the collar, which forces Jake to send his ship back to the awaiting Mother Ship and stay on Earth in order to help rescue his friends. Jake and Frank use a broken-down biplane to rescue Liz and Lucybelle from Olympus's helicopter, which crashes, but Olympus, Stallwood and their men survive are are presumably arrested. In the final scene, Jake is allowed to stay on Earth as a representative of a off-world "friendly power", with Jake applying for and being granted U.S. citizenship.
What nickname does Frank give to the cat?
Jake