Nightmares (Stradun)

Nightmares are monsters created by Dr Anton to fight the Coaster Force (later Nitro) Rangers.

Ajax
Ajax was a sky beast that was manipulated and gain a strong resemblance to Speedwing from Power Rangers Super Ninja Steel and Power Rangers Hexagon.

He was first defeated by the Sister Storm Strike then the Firehawk Cut when regrown.

Arsenal

 * He was equipped with a machete

Panda Mime
Panda Mime is a Panda themed Nightmare. He was added to a scheme of Kosarin and Jezella's to build an Escape Room that the rangers couldn't beat.

In the meantime, along with Bauri; Necro; and Wing-Bat, Lucas/Laser (as Auto Cop) was the only hero able to transform and face the pending threat.

The rangers were able to escape. The girls soon found they had unlocked new forms. Lucas and Fiona (as Dragon Rider) defeated him before Lucas took the helm of Coaster Force Megazord and killed him with Super Drive Strike.

Malwit
Malwit is a wizard themed rouge that was retrofired by Dr. Anton. He controlled a force of grunts on the 6 Coaster Force Rangers (as Peter was in the UK). He was eventually taken down by Accelerator Megazord and Drachen Megazord combinations.

Power and Abalities

 * He has a staff that can spawn all the foot soldiers seen to date

Swamp Bat
Swamp Bat was a hybrid of the remains of Ajax and Swamp Thing (the first two monsters) that was created by Dr. Anton with a likeness to that Bauri, Necro, and Wing-Bat.

He was swarmed by an army of bees via Fiona's zooligualism, later Coaster Force Megazord.

Red Bull
In order for the Red Bull brand to gain popularity again, Doug was allowed to use the name for a monster in the form of a sponsership.

The monster itself was one of Jezella's stuffed animals who she sent to cause mayhem during The Week of Color at Cal Reef. Mel, Stella, and Fiona chase him through a China Shop, However, Jezella returns him to his stuffed animal form until dusk.

With the boys, they can take him out, but Jezella's silva, mixed with the toxin of a death plum (vampires can only be killed by burning them) causes the Bull to rampage at a giant scale, but survives due to an error by Jezella.

Steel Soul
Steel Soul is a Nightmare made of scrap steel and was sent to find more to clone him. However, the Coaster Force Rangers found it first. He was first defeated by FINAL WAVE. When the rangers unleashed Union Jet Thunder, he was defeated by that as a giant.

Shell Blade
Shell Blade was the first monster that the rangers faced after "Shifting into Nitro" and Teddy's graduation.

He plans to drain their new found power, but sacrifice the Drachen Fyre and Accelerator trains so they could use their new attacks to defeat him. Just when he is regrown, Mel gives them the Nitro Zords to do the job.

Powers and Abilities

 * He has the ability to absorb power within him, such as the auxiliary trains or even whole team powers.

Arsenal

 * He possesses a centipede-like attachment which can attack like a whip

Stone Monster
Stradun Stone Monster was a monster that was made of corrupt rock in the caves of the Monster World that ended up in the Human World.

Mel became Nitro Yellow briefly due to Takshiel being on his deathbed and being reborn as the new Steel Venom ARC.

Unlike the other monsters, he was not regrown because his counterpart wasn't

Storm Rat
Storm Rat is a hair insect monster. He kidnaps Micheal Wallace, and the AZCK girls. When the Nitro Rangers chase after him into the Monster World to save them. Along with Storm Rat, they almost defeated every monster of the Stradun.