The team faces fresh threats from the deep and the ancient past:
: A mischievous monkey-like character who brings chaos to both Mystery Mountain and the city.
Season 4 moves beyond the core trio of Catboy, Owlette, and Gekko by introducing , a space-loving boy who becomes a hero after an asteroid incident. PJ Masks Season 4 Complete Pack
: To combat these threats, the team debuts the PJ Jet for sky missions and the PJ Sub for underwater battles in the newly introduced Crystal Garden .
: An ancient Egyptian boy who uses his "Pharaoh Feathers" and boomerangs to cause trouble. The team faces fresh threats from the deep
: A scientist-hero who aids the PJ Masks during space missions, though he sometimes struggles with the physical side of hero work.
: The dragon girl of Mystery Mountain continues to play a vital role, often guiding the team through magical challenges. : An ancient Egyptian boy who uses his
: A new octopus-girl villain who lives in a moat and is obsessed with her crystal collection. She frequently clashes with Gekko and the team using her aquatic powers.
