Cephalic Carnage

On a distant planet
A place devoid of life
Before that un fateful day
Enviovore arrived
On that distant planet
Revolving around the sun
Little did it know
Here demise was sure to come<
Landing in the ocean
Inseminates its seas
Procreating organisms
The water comes alive
Spreading like cancer
The planet thrived
Evolving constantly
Breeding amphibian's life.
As water dries up
Legs develop