Monsters

Mighty Morphin Power Rangers (season one) Monsters
Monsters primarily created by Finster, and on rare occasions, Rita Repulsa.

Mighty Morphin Power Rangers (season two) Monsters
Monsters created by Lord Zedd, and occasionally Finster.

Mighty Morphin Power Rangers (season three) Monsters
Monsters created by Lord Zedd, Rita Repulsa, and Finster.

Power Rangers Zeo Monsters
Monsters created to fight for the Machine Empire.

Power Rangers Turbo Monsters
Monsters used to fight for Divatox.

Power Rangers in Space Monsters
Monsters primarily used by Astronema.

Power Rangers Lost Galaxy Monsters
Monsters used by Scorpius, Trakeena, and Captain Mutiny.

Power Rangers Lightspeed Rescue Monsters
Demons created from cards by Jinxer.

Power Rangers Time Force Monsters
Mutant criminals from the year 3000 freed by Ransik.

Power Rangers Wild Force Monsters
Org spirits revived and fused with modern-day objects.

Power Rangers Ninja Storm Monsters
Evil space ninjas employed by Lothor.

Power Rangers DinoThunder Monsters
Mutants created to fight for Mesogog.

Power Rangers SPD Monsters
Random criminals mostly employed by Gruumm, some created by Mora.

Power Rangers Mystic Force Monsters
Monsters from the Underworld.