At the manor of Lord Monkey Fist, the simian-like villain receives a prophecy from a mystic monkey monk, who says he should find a suitable monkey and follow him to the stars, and there "the ultimate monkey master will be unstoppable." Back in Middleton, the space center is having their annual "Rocket Boosters" event, and Kim doesn't wish to go, since she's too old for it, but is having trouble communicating this to her father.

Unknown to her, Monkey Fist plans to use Frederick, a new monkey astronaut who will soon be travelling to a space station, to fulfill the prophecy and invades the space center as Kim (and Ron, who came along for the rocket shaped cookies they have) have left, the former unable to tell her dad to stop treating her like a child. Kim ultimately decides to go back, (despite Ron's misgivings about Frederick due to his monkey phobia), but finds things suspicious when she does. Managing to get in through the air vent, Kim learns Monkey Fist has taken everyone hostage to force Frederick to go with him. Despite her best efforts, the villain manages to board a shuttle towards the station, unaware that Ron & Rufus have accidentally stowed away.

Upon learning that Ron is stuck up in the space station, Kim & Frederick head off to save him, using a new experimental rocket from her dad. Arriving at the space station, the two join Ron in battling Monkey Fist and his ninjas, thanks in part to Frederick disabling the station's artificial gravity; with the villain defeated, Frederick chooses to stay behind to complete his mission, and he and Ron part as friends. Returning to Earth, Kim is glad her father finally treats her like a teenager, even though it comes with some tough new rules. Meanwhile, the monkey ninjas meet up again with the monk, who admits he made a mistake; his message was actually "the ultimate monkey master will be ''Ron Stoppable''", leading them to arrive at Bueno Nacho, much to Kim & Ron's confusion.

!! This episode contains examples of:

* AirVentPassageway: Kim & Ron use this to get into the Space Center, with Kim [[LampshadeHanging lampshading]] it.
--> '''Wade:''' Looks like your best bet is through an air vent on the roof.
--> '''Kim:''' Isn't it always?
* ArtificialGravity: The space station has it.
* [[BatmanCanBreatheInSpace Kim Possible Can Breathe In Space]]: Although there could be built in oxygen in both the shuttle and space station.
* BeCarefulWhatYouWishFor: Well, Kim wanted her dad to stop treating her like a child and he did, but also imposed a new set of tougher rules for her to live by.
* ContinuityNod: Ron's flashback of being tormented by the Camp Wannaweep monkey from [[Recap/KimPossibleS1E13MonkeyFistStrikes Monkey Fist Strikes]] is shown again so Kim can explain his fear of monkeys to one of the kids.
* EverythingsBetterWithMonkeys: Played straight with Frederick, but averted with the monkey ninjas.
* INeedToGoIronMyDog: Kim decides not to tell her dad to stop treating her like a kid and excuses herself by saying "I have Ron something."
* InstantExpert: Kim can pilot a space shuttle back to Earth after having seen Frederick do it only once.
* LatexSpaceSuit: Frederick & later, Kim both wear one.
* LiteralMinded: After the heroes confront Monkey Fist and he asks what they're doing there, Ron replies that it's the Rocket Booster open house and they're there for the cookies.
* NoGravityForYou: Frederick disables the space station's ArtificialGravity, thereby allowing Kim to cream Fist and his ninjas.
* OffModel: At the beginning and end of the episode, Monkey Fist has his old, square chinned, more human appearance.
* OverprotectiveDad: Mr. Possible is one, PlayedForLaughs ("rule one, no boys, ever").
* ProphecyTwist: What the mystic monkey monk meant to say was the ultimate monkey master would be ''Ron Stoppable'', not "unstoppable."
* SheIsAllGrownUp: Most of the episode is Kim trying to get her dad to accept this.
* ShoutOut: [[Film/PlanetOfTheApes "Get your paws off me, you stinking monkey!]]
* StatusQuoIsGod: The whole thing of Ron being the ultimate monkey master and the monkeys obeying him was dropped after this episode and never again referenced.
* UnfinishedUntestedUsedAnyway: Mr. Possible's shuttle had never been used before, but it was the only shuttle they had available to travel into space.
* YouCantFightFate: "Frederick, you cannot fight destiny, it's just not done."