Kowalski travels back in time to prevent himself from building a time machine.

When Roger's sewer home becomes unbearable, the penguins try to find him a new home in the city.

The penguins must protect the zoo commissioner from Frankie the pigeon's wrath.

The penguins try to help Randy overcomes the problems he's having at the petting zoo.

Eggy the duckling is convinced that he can handle dangerous missions like the penguins.

It's a race against time when the whole gang competes with the Rat King to find the Lost Treasure of the Golden Squirrel, which may have a dangerous curse on it!

When the penguins realize their operation is at risk of being exposed, they attempt to destroy the evidence.

The penguins and Julien believe Marlene has cooties after overhearing a group of schoolchildren.

The Amarillo Kid arrives and declares that he has a score to settle with "Mr. Tux."

Private is ready to move up in rank within the penguin commando unit... or is he?

A group of cockroaches ask the penguins for help with their exterminator problem.

The penguins become convinced that a kid on a field trip to the zoo is spying on them.

Private wants to be friends with a group of badgers... until they threaten to hurt Marlene.

When the Penguins send Rico off to help King Julien, an unlikely friendship develops between them.

Julien causes chaos at the zoo when he steals Kowalski's new invention.

The penguins accidentally launch Leonard the koala out of the zoo and into midtown Manhattan.

When animals begin disappearing, the penguins suspect Savio, the new boa constrictor.

Private tells Mort that if he throws a penny in the fountain, his wish will come true... and it works!

Julien goes on a pranking spree when he learns about April Fool's Day.

Rico desperately wants to a voice chip upgrade for his doll-girlfriend.

A puffin from Skipper's past returns and tries to take over the penguins' habitat.

After a series of gadget malfunctions, Skipper orders Kowalski to stop inventing.

When a baby stroller rolls outside the zoo, the penguins redefine the term "daycare."

The penguins' car seems to have a mind of its own after Rico rebuilds it.

Kowalski steals the computer chip from Mort's new video game to finish an invention.

The penguins must stop a contractor from completing repairs on their habitat before he destroys the world!

Two thieves stash a very expensive diamond necklace at the zoo.

When Skipper is knocked on the head, he's unable to lead the penguins on an important mission.

Private accidentally drinks Kowalski's truth serum and starts spilling the penguin's secrets to the rest of the zoo.

When the zoo is closed for Christmas, the animals prepare for "Kidsmas" -- their annual celebration complete with decorations, food, gifts and a visit from Santa.

Julien believes Maurice is plotting an overthrow and the penguins send him through basic training.

Burt the elephant discovers a love for painting, and he's remarkably talented.

Private is smitten with the zoo nurse, but the only way he can see her is to get injured.

The penguins have a plan to beat the heat, but they'll need Alice out of the way.

Kowalski's attempt to super-charge his brain backfires and now he's dumber than mud.

The lemur habitat gets a new resident, Clemson, and Julien loves to order him around.

Private finds a stack of comic books and ignores Skipper's request to destroy them.

Shakespeare in the park has inspired Private as he struts around quoting from the Bard's works.

A simple plan to have Mort spy on the rats ends up with Julien and Skipper captured.

The penguins accidentally blow up the koala habitat wall, so Leonard has to bunk up with Joey.

King Julien and Skipper switch places for a day, troubling everyone involved.

The penguins intercept a fax with catastrophic news -- Maurice has only 24 hours to live!

When Private's cuteness factor tests off the charts, the penguins use it to their advantage.

Annoyed by the lemurs' constant music, the penguins plan to get them moved to another part of the zoo.

The animals panic when a boa constrictor escapes from the zoo.

Kowalski's invention turns Skipper into a baby, so the penguins must find a way to change him back.

The penguins journey to the bottom of the Atlantic for preserved herring.

Private's quirky Uncle Nigel pops in for a quick visit from across the pond.

After a sailing trip to the Massachusetts coast goes wrong, the penguins wind up at the Hoboken Zoo, which turns out to be a perfectly pristine paradise... or is it?

Dr. Blowhole, the penguins' evil dolphin nemesis, returns to New York with a diabolical plan to turn them into creatures of destruction.

The Vesuvius twins adopt Skipper and Julien, then force them to fight each other.

Kowalski invents a group of tiny robots, which he says will protect the penguins from harm.

The penguins are inspired seeing a good deed and decide to perform their own.

Mort and Private are sucked into a vending machine after trying to retrieve a snack.

Kowalski's time-stop invention falls into the wrong hands -- Julien's!

Special Agent Rockgut contacts the penguins with a warning that Red Squirrel has brainwashed one of them.

The animals think Julien caused old lady Gladys to slip and hurt herself.

Kowalski is laid up in the hospital, so he can't attend the invention expo, and it's driving him crazy.

Private accidentally steps on Dale the snail, so Dale wants some payback.

Julien becomes enamored with the gigantic toilet that the penguins built, but it's all a trap!

Private's heart overcomes his instinct to flee as he helps a stranded seal get back to Antarctica, and the rest of the team follow in the submarine to make sure they make it.

Julien is supposed to keep quiet about the penguins' secret tunnel, be he blabs anyway.

Kowalski tries to bring a penguin species back from extinction, but clones a Dodo instead.

Skipper orders Kowalski's love ray to be put in reverse.

When the penguins discover that Jiggles is still alive, the others start squishing it, which makes it multiply.

Lemmy the robot returns from Mars with a space squid.

Marlene plans a game night to help the zoo animals bond but it takes a terrible turn when the snacks run out.