Martian (Jimmy Neutron)

The Martians are a rock-based species native to the red planet Mars.

Biology
They are large stone-based humanoids with three eyes and tridactyl hands. Their method of reproduction is unknown. For an unspecified reason, water seems to hurt them, this being the reason they drained their lakes and oceans.

History
They were first encountered by Jimmy Neutron and his friends, and his arch-enemy Eustace Stritch, all of which mistook them for mere statues, guarding their planet's power source. They were then awakened and explained that Mars is not a dead planet, and then attempted to destroy Earth, being tired of Humans sending probes and rovers to their planet, while also believing them to be planning an invasion. However, this was thwarted by Jimmy who made it rain on them, which seems to be acidic to them.