Madtropolis (voiced by Dallas Barnett) is a bull and eye-themed monster that looks like he has a miniature city on top of his head. He serves as the primary antagonist of the first and second part of the three-part episode "The Samurai's Journey".
Madtropolis first tricks Marah and Kapri into thinking that he was Lothor being nice to them, he was summoned by Zurgane to steal the ninja powers from the Power Rangers, he appeared with an army of Kelzaks and Marah and Kapri to battle Tori and Cam, they had the upper hand until Shane, Dustin, Hunter and Blake came, the Rangers morphed and did battle, He was able to best them and take their ninja powers.
He along with Marah and Kapri and the army of Kelzaks retreated, he was then about to blow up the ball with the ninja powers, but the Crimson Ranger manages to retrieve it (as Cam gave the Ninja Rangers a power surge to let them turn into their Ranger forms), the Red Ranger tried to battle the monster, but he was quickly outmatched, he then created illusions that the Rangers must overcome. they manage to overcome it, but their power surge was wearing off, and Madtropolis was still not finished, with the last of their energy, they defeat him with the Thunderstorm Cannon.
Madtropolis grew large with the Scroll of Empowerment and after Cam transferred the ball back to Ninja Ops, the Rangers summon the Storm and Thunder Megazords to battle the monster, but without their powers, they were outmatched. Cam sent in the Power Sphere 9: Scarf to protect the Rangers, the Rangers did had an small advantage, but it was not enough, after defeating both the Storm and Thunder Megazords with his Lightning Beam, he was about to make the finishing strike on the Rangers until Cam used the Scroll of Time to freeze everything, with time frozen, Sensei was able to teleport the Rangers back to safety in Ninja Ops, when Cam succeeded his mission, the Scroll of Time was losing energy, which caused the Rangers to be teleported back to the monsters view, luckily the new Green Samurai Ranger appears and pilots the Samurai Star Copper to battle Madtropolis.
Madtropolis was taken down to the ground when the Zord drilled though the ground, the Green Ranger transformed the Zord into the new Samurai Star Megazord and used the new Power Sphere 10: Bee Stinger to ultimately destroy Madtropolis, after the monster was destroyed, the Green Ranger revealed himself to be none other then Cam.
Madtropolis was seen in an alternate dimension.
Madtropolis was among the monsters freed from the Abyss of Evil by Lothor.