The monsters of Sledge's group were collected in Sledge's bounties across the universe and held in his spaceship's prison. Sledge and his minions would send each one down to Earth to fight the Rangers in exchange for their freedom. To make a monster grow, Sledge would have the Magnabeam fired onto them.

Iceage Iceage
An impact winter-themed monster who the first of Sledge's captives to be offered freedom for the Energems. He can perform ice attacks. After a failed attempt to take the Pink Energem ends with him being flung off the distance by the T-Rex Zord, Iceage resolves to attack the city with a horde of Vivix and two Vivizords. Iceage is destroyed when T-Rex Zord gives Tyler an added boost to his Dino Morpher Blast's Final Strike.
"Powers from the Past" & "Past, Present and Fusion"

Scrapper Scrapper
A car crusher-themed monster. He can tuck his body into his right arm for swift mobility and shoot lasers from his arms. After Sledge catches him trying to escape, Scrapper was offered to assist Sledge in obtaining the Energems from the Dino Charge Rangers in exchange for being chaperoned to any galaxy he wants. He was destroyed by the Dino Charge Megazord Tri-Stego Formation's Final Strike.
"A Fool's Hour"

Slammer Slammer
A prison-themed monster. He can trap anyone in his laser cages. Slammer was sent down by Fury to find the Energems. He was destroyed by the Dino Charge Megazord Stego-Raptor Formation's Final Flame Strike.
"Return of the Caveman"

Spellbinder Spellbinder
A raven/bank vault-themed monster that wears a cape that blocks all shots and can shoot arrow feathers. He was sent by Sledge to obtain a pendant from Moana that can enable the user to control the minds of anyone. He was destroyed by the Dino Charge Megazord Para-Raptor Formation's Fireball Finish while the pendant was salvaged by Sledge and Wrench.
"Breaking Black"

Cavity Cavity
A Pastry chef-themed monster with a whisk for a right hand and an pastry bag-shaped gun for a left hand. He can shoot decay beams from his mouth and shoot laser beams from his gun. Poisandra released Cavity to make her a wedding cake for her wedding to Sledge. After testing his mouth decay cake on Fury, Cavity is sent by Sledge to give the Dino Charge Rangers a toothache. Dino Charge Megazord Tri-Stego Formation destroys Cavity's teeth and uses the Stego Saber's Final Slash to destroy Cavity.
"The Tooth Hurts"

Sting Rage Sting Rage
A monster who wields a staff that can shoot infectious stingers to render their victims in a berserk state. Sting Rage was sent by Poisandra where he manages to hit Koda with his stinger, having also used his power on the Ankylo Zord. Shelby manages to remove the stinger from the Ankylo Zord before defeating Sting Rage with her Dino Drill. After forming the Dino Charge Megazord Tri-Ankylo Formation, the Rangers destroy Sting Rage with the Dino Charge Megazord Tri-Ankylo Formation's Final Hammer Punch.
"Let Sleeping Zords Lie"