After Leonard the koala watches a ninja show, he begins to "sleep fight" the zoo animals like he is a ninja so the penguins must a find a way to cure him to stop "sleep fighting" which does work but things turn for the worse when the rats are out to get him.moreless
Skipper chooses to reward Private for his valient effort on missions by taking him and his fellow Lunacorn fans to see "Lunacorns on Ice" - Bing and Roy!
When the Commissioner's toupee blows off and gets stuck on Maurice's head, the baboons mistake him for a male and indulge his every whim.
The penguins' new food-making machine releases toxic substances into the atmosphere, which causes a dangerous increase in climate change.
Marlene arranges a game night in the zoo but Skipper isn't too sure about it, Kowalski, Maurice and Mort go to get some candy, but get caught.
Kowalski invents a love ray to make Doris fall in love with him, but the device backfires and people start hating him instead.
The penguins sneak out of the zoo at night to party with the other animals in the park, but they have trouble getting home by morning.
Private helps a young leopard seal return to Antarctica, and his pals follow him in a submarine. However, danger looms when they get to their destination.
Against Alice's prohibition, a woman named Gladys sneaks various snacks to the zoo animals, as she had done previously.
Kowalski creates a time-stopping stopwatch, which freezes all but those touching the device.
After the penguins witness a boy returning a dropped dollar to a man and calling it his "good deed for the day," Skipper decides that the team will seek to increase the frequency of their own good deeds.moreless
Skipper and Julien are captured by the Vesuvius Twins and brought to their house where they are forced to fight each other.
While Skipper went on his solo mission, Dr. Blowhole wipes Skipper's memories away and Dr. Blowhole uses his memories to locate Kowalski, Private, and Rico.
The Penguins try to take a relaxing trip to Cape Cod, but a storm ends up taking them to a place that none of them would ever want to be stuck in: Hoboken, New Jersey! If that wasn't bad enough, the Penguins get taken to the Hoboken Zoo were to their horror, nearly every single rude, mean, nasty, or evil animal that the Penguins have ever faced off against are located here! Although the animals have claimed to be reformed, Skipper is certain that there must be something sinister hidden behind and/or beneath the seemingly delightful exterior of the Hoboken Zoo. Is the Hoboken Zoo really more than what it appears to be on the outside, or is it really a nice play to stay? Also, in a B story, when the Penguins are found to be missing, the lemurs decide to help themselves to the TV in the Penguins cave, only to have King Julien frustrated when he is not able to find the remote control that can change the channel.moreless
When Uncle Nigel comes to visit the penguins, Nigel reveals to Private that that he is a secret agent on a mission to catch the Red Squirrel.
When Kowalski's ray designed to freshen spoiled food accidentally hits Skipper before falling down a storm drain, the leader is turned into a baby penguin, albeit retaining much of Skipper's adult personality.
After learning of Savio's escape from Hoboken on a TV news report, the penguins organize an effort to protect the zoo from the vengeful boa.
Annoyed by the lemurs' music, the penguins arrange to relocate them to the adjacent petting zoo and move Roger to the lemur habitat.
The penguins try to use Private's cuteness to their advantage. But Private gets fed up with everyone using him and decides not to use his cuteness anymore, even when he and the other penguins are about to be shipped to another zoo.moreless
After the penguins accidentally destory his habitat, Leonard moves in with Joey, but they have a little trouble getting along.
Mort is declared the new king of the rats due to a birth mark on his tail. But then the penguins hear that Mort is planning to lead the rats to invade the zoo and must find a way to stop him.moreless
Kowalski, Private and Rico decide to become superheros after reading a few comic books and their new personas might come in handy when they hear about a theif loose in the zoo.
Officer X becomes the substitute worker at the zoo while Alice goes on vacation and he is determened to get revenge on the penguins for all the misery they have caused him.
Julien creates a resitance force when he believes that Maurice and the other zoo animals are planning to overthrow him.
It's Christmas Eve at the zoo and the penguins, along with all the other animals, are in charge of making the zoo into a huge Christmas party for all the little animal kids. But everything has turned to chaos when the animals can't agree on what the party's theme should be and Julien, who is in charge of getting the Christmas tree, steals the tree from the centre square of the city. Skipper realizes that the only one who can help them is Santa Claus and he and Private go on a frantic search to find him before their party is ruined.moreless
After getting a kid's balloon back, Skipper mentions something about The Big One. He explains he has been waiting for it to come for months and he hid some plans in a remote area of the zoo for when the big one comes. But it is revealed that they are building a children's zoo on the spot he hid the plans, so now they try to get the plans before The Big One Comes. But Skipper then starts acting like a news reporter. Can Skipper stop acting like a reporter, and can they get the plans in time before the Big One comes?moreless
The penguins have to stop an overeager repairman who's about to find their secret headquarters.
Mort becomes addicted to a video game that he found in the lost and found box until Kowalski steals the microchip for it so he can use it for his new invention. But then Kowalski feels very guilty for what he did to Mort and he tries to make things right.moreless
After a few mishpas, Skipper forbids Kowalski from inventing anything. But Kowalski secretly creates an invisibility ray that goes haywire and starts turing everything invisible. Now Kowalski must find a way to stop the ray without Skipper knowing about it.moreless