One Sentence Summary
The penguins use one of Kowalski’s inventions to become ignorant of pain, to remove a hornet nest from the zoo.
The penguins are analyzing a new mass that is hanging from the clock tower at the entrance to the zoo that showed up in the middle of the night. They go and poke at it with Kowalski's Six-Foot Whacking Stick and out comes a hornet threatening to sting them.
They ask the hornet to leave, offering to find a quiet place in the park to relocate the nest, but the hornet has no intention of leaving. The penguins threaten to use force. But more hornets come out and chase the birds back to their habitat. Skipper tries to assemble a new plan, but the hornets chase them again.
Kowalski tries to invent a pain elimination helmet but it doesn't work. When Mort falls into their habitat, he seems ignorant of any pain, so they try using him to remove the nest, but he doesn't understand the job - and they are chased back and stung a third time. This time, Kowalski builds a machine to erase painful memories so they can go and get the hornets.
They test the machine on Private first and he ends up being as dumb as Mort, and plays with the machine, which accidentally makes all of the penguins completely ignorant to pain and all act like Mort. A school bus arrives with children and all of the hornets are about to sting them when the stupid penguins come and try to play with the hornets, beating them all up in the process.
Then King Julien arrives and all of the penguins go for his feet like Mort would do. Mort sees this and becomes jealous, and gets Kowalski's cardboard box full of their intelligence and threatens to hug it. In doing so, this returns the penguins to normal. Kowalski however still has some of Rico's thoughts in his head, and while spasming, comments on how horrible it is. Rico just shrugs.
King Julien finds out that the zoo has "bees" and mentions that bees have honey, before ordering Mort to get it. Mort runs to go tear apart the hornet nest looking for it right as the hornets are about to sting the school children who just got let into the zoo. The hornets leave the zoo, but King Julien is confused as to where the honey is. The episode ends with one hornet saying "I sting your face" and stings at the camera.
Airings on channels other than Nickelodeon USA