"Newton and the Ninjas" (also known as "Hector Etoile et le Ninja barbu" in French) is the second segment of the 7th Season 4 episode of PJ Masks.
After his experience with Romeo, Newton has sworn off fighting villains! 
On the advice of his new friends, Les Pyjamasques, Hector Etoile goes for a walk in town to do good. But Ninjaka is just out tonight.
The following characters appeared in the episode "Newton and the Ninjas":
Greg, Amaya and Connor meet up with Newton, who is in the library studying for his next night of space exploration. They try to convince Newton that he should not just save the day when he is with them, but also try solo missions. Newton is reluctant, but ultimately agrees. Before he leaves, he gives the three a Listening Stone so they can contact him.
That night, Greg, Amaya and Connor transform into the PJ Masks and meet up at HQ, while in another section of town Newton transforms into Newton Star. After checking up with his asteroids, he tries his first solo mission. He is approached by Night Ninja, who has disguised himself as an old man and claims to need help. Since Newton doesn’t know Night Ninja yet, he falls for the trick.
While the Ninjalinos keep the PJ Masks busy, Night Ninja takes Newton to Mystery Mountain. He tricks Newton into carrying him up the mountain, during which Newton notices Night Ninja is quite heavy. Once they reach the cave near the top of the mountain, Night Ninja uses his levitation trick to capture Newton. Night Ninja reveals he’s not truly an old man, and that he used heavy splat to make himself so heavy that Newton would tire himself out from carrying him, and thus no longer be able to fight back. The reason he needs Newton is because the cave contains an extraterrestrial weapon named the Space Laser Staff that is embedded in the wall and can only be activated by Newton’s powers. Night Ninja glues Newton to the wall of the cave, and forces him to release the staff.
Night Ninja flies off with the staff. Newton uses his last strength to free the stone on his suit from the sticky splat, and contact the PJ Masks. The PJs hurry to Mystery Mountain. Catboy tries to alert An Yu, but she fails to respond. They call Newton to ask him where he is, but can’t help him since Mystery Mountain has hundreds of caves. Since they can’t help him directly, they encourage Newton to solve the situation by himself.
Newton gathers his strength, and breaks free from the sticky splat. He attacks Night Ninja, and touching the staff returns Newton’s powers to him. After a brief aerial struggle, Newton takes the staff away from Night Ninja, and sends it back into space where it came from. Night Ninja and his Ninjalinos retreat, while the PJ Masks congratulate Newton in his first successful solo mission. On top of the mountain, An Yu finally leaves the pagoda and wonders if she missed something.
- Believe in yourself.
- Use your powers for good.
- You can't always rely on others to do something for you. Be independent.
- Night Ninja and his Ninjalinos meet Newton for the first time.
- Newton visits Mystery Mountain for the first time.
- This episode introduces the Listening Stone.
- In this episode, Newton's transformation was shown for the first time.
- Newton narrates the episode title for the first time.
- This is the second time Newton says the PJ Masks' motto, "Time to be a hero!".
- Although Romeo himself doesn't appear in this episode, the "After his experience with Romeo" part of the summary may have referred to the events of the previous episode.
- This is the first time Night Ninja disguises himself as an old ninja.