Marv is a strange looking green robotic creature with head resembles a mix of hammerhead shark and a frog with a laser scope on the right side, a tadpole-like body with a dorsal fin on the back, and 3 knife-like fingers with jagged lines on them on its arms.
- Attack: Low
- Life: Average
- Speed: Very Fast
When a space slug is crossed with a terrestrial eel and patch up with Cyber genes, there are sparks! Watch out, you can be hurt!
- Its name is taken from a character in Sin City, also named Marv.
- This mutant bears a slight resemblance to Black Manta from DC universe.
- Gold Marv has a basic stat of 196 instead of 203, it is changed back to 203 in it's platinum version.