Peri and Entree create this monster machine in the Doctor's lab, where they intended for their new friend, Melvin to prove that they really saw a real monster.
In The Mutants Who Cried Monster, Peri & Entree make Melvin use it to rampage the town.
Robo-Zilla has two sounds. Godzilla's roar and a robotic T-Rex roar
In Helen,the eye is pink and in The Mutants That Cried Monster, the eye is green.
- Melvin is never seen when he pilots it.
- Peri does not appear either when he pilots Robo-Zilla
- Robo-Zilla mostly looks like a robot tyrannosaurus with a flame-thrower,talons,laser vison,a cup-holder and a blood-curling roar.Also a solar panel behind it's head
- It is very simular to the bipedal robot Metal Gear REX from Metal Gear Solid
- Blood-Curling Roar
- Razor-Sharp Talons
- Fire Breath
- Cup Holder