: The season sets the stage for the team eventually evolving into the "Power Heroes," incorporating more specialized allies. New Villains and Locations

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.

: 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.

: A scientist-hero who aids the PJ Masks during space missions, though he sometimes struggles with the physical side of hero work.

: A mischievous monkey-like character who brings chaos to both Mystery Mountain and the city.

: An ancient Egyptian boy who uses his "Pharaoh Feathers" and boomerangs to cause trouble.

: 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 .