Lord Peel captures the Monkeys and intends to make them pay for turning him from a mild-mannered alien who happens to look a lot like a banana, into an embittered super villain obsessed with revenge.

For Gus and Wally, scary equals funny, and they perform a series of pranks on each other to illustrate this comedic theory for YAY-OK. Not to be outdone, YAY-OK puts together a terrifying joke of his own.

It is Inspection Day, and the Rocket Monkeys are far from prepared. Gus thinks it will be easy enough to talk his way out of a bad report, but Wally's unhinged behavior threatens to interfere.

A fitting for new space-suits reveals that Gus's tail has grown just enough to classify him as a rare long-tailed monkey, which attracts Gamester X, an alien determined to add Gus to his collection.

After challenging the undefeated Space Gorillas to a match on the popular game show "Galactic Laser Blast!", Gus decides the only way the Monkeys can win is to bring in a ringer—YAY-OK.

Wally finally gets his own pet: Trixie, a toothy beast with an appetite for EVERYTHING, from the monkeys' food supply to the ship itself. As much as it hurts Wally, insatiable Trixie must be stopped.

Gus and Wally have a surprise for YAY-OK: they have located his estranged father. But YAY-OK has mixed emotions, as it turns out his dad is actually a doomsday device that had been powered-down for the good of all mankind.

Tired of Wally always touching his stuff, Gus gets his brother to promise "paws off." But when Wally's faced with Gus's Deep Space Dave laboratory play set, the temptation may prove too much.

Gus and Wally are shocked when their mom reveals her new suitor, Lord Peel. To prove he is a changed man, Banana-dude insists on highly hazardous, monkey-endangering fun.

An unfortunate haircutting accident reveals the crown-shaped royal birthmark of Eld under Wally's fur and his royal destiny as the rescuer of the frozen Princess Von Monkey.

Mission: escort criminal mastermind Monkevil to the prison on Alfatraz 8. No problem, until their prisoner turns out to be a beautiful female monkey who soon has Gus and Wally fighting for her love.

GASI has a new recruit: Monkevil, former super villain, and Gus and Wally's long standing crush. Though she excels during training, YAY-OK suspects that she has returned to her life of crime.

Nefarious's latest evil invention gives him control over Wally's tail.

A batch of toxic bananas has infiltrated the market, zombifying any primate who takes a bite, including Wally. Gus must travel to the bananas' source planet and find a cure for the zombie germ.

When Gus blames YAY-OK for his own mistake during a training exercise, Dr. Chimpsky sends them YAY-OK7, an updated replacement who is quick to assert his superiority over the original model.

The Monkeys are on lockdown until they clean their ship. Desperate to make it to All-You-Can-Eat-Monkey-Mondays at the GASI Café, they take a few shortcuts—and end up waking a hideous garbage monster.

When the trash-talking Space Gorillas hijack Gus's mission, the 'Rilla-Monkey rivalry returns with a vengeance. To redeem themselves, the Rocket Monkeys take on their most dangerous mission yet.

Gus and Wally cannot help themselves when it comes to anything round and bouncy—which makes it awkward when Chimpsky entrusts them with the highly explosive BALL (Ballistic and Lethally Loaded).

Gus takes a game of Trash Torpedo too far, shooting Wally's beloved ukulele into space. To get it back, the Monkeys must face Pinky-Winky, a mean-girl space creature with musical plans of her own.

Gus and Wally only need one more badge before they receive the prestigious GASI Red Tassel of Achievement, so when the opportunity arises to save a stranded princess, the boys jump at the chance.

Gus and Wally are charged with herding 2000 Zortoids through space for their annual feeding at Gluttonia, but Wally must face a test of his monkey ethics when he befriends one of the herd.

Gus and Wally win the "Have-Deep-Space-Dave-Stay-at-your-Place" contest, but Deep Space Dave proves to be an annoyance as the Monkeys tend to his every need.

A dangerous comet threatens to demolish Gus and Wally's beloved Banana Snack Shack.

Gus rescues a cool monkey named Joel and they quickly become best friends, but this new pal has a suspicious interest in Inky's highly collectible splatter art.

Lord Peel is out to expose the Rocket Monkeys' incompetence on his new tell-all television show, and the resulting backlash has Dr. Chimpsky insisting Gus and Wally change their ways.

Lord Peel seeks revenge on Gus and Wally by impersonating Santa and tricking them.

Gus and Wally try to get to a Christmas party before all there cake is eaten.

Wally sets out to return the delicious spirits of every banana he's eaten to their home planet.

Looking to expand his social circle, Wally reaches out to Spacebook-and instantly has hundreds of friends.

Gus makes a monster movie and posts it on Space Book (a parody of Facebook). The whole galaxy except YAY-OK and the monkeys think that YAY-OK has a disease because it was viral.

YAY-OK is put in charge by Dr. Chimpsky to decide whether Gus or Wally should be in charge of their money, after they blow all of GASI's budget on a shopping spree.

Gus and Wally let evil counterparts enter the world.

Gus and Wally lose their fun privileges.

YAY-OK becomes a bully when the monkeys re-wire him.

On GASI's "Switch Day," where everyone gets a new partner, the monkeys both end up getting a gorilla as their partner.

Wally has a flea who eats almost everything on the ship and hypnotizes him attached to his head.

YAY-OK meets his creator who thinks he is no good anymore and hurts his feelings.

When the Monkeys are relegated to the kids' room at a party, Gus decides to infiltrate the adult festivities next door.

While combing the dump for replacement rocket parts, Wally stumbles upon a Spacey Cake oven.

Gus and Wally use all of Inky's ink so they must get more

Gus and Wally keeping an animal.

Gus and Wally discover the truth about Pinky Winky's real size.

YAY-OK takes a job as a butler for Lord Peel.

Nefarious finally gets to leave his asteroid, only to see his family.

The Monkeys mom comes to visit.

Gus teaches Wally about survival, while on a stranded planet.

Wally believes he can take on anything.

Gus and Wally compete to become a sidekick.

He-Rilla & She-Rilla are getting married but Gus hurts She-Rilla's feelings at the wedding and he must make her feel better again.

Gus has never liked birthdays, but he gives in and opens what he assumes is Wally's birthday surprise - a box of Green Goo.

To keep the Monkeys safe, YAY-OK purchases a state-of-the-art primate protection device.