Martain in my Head

There is a martian in my head.
I think I'll call him Fred.
He knows many things from here to Plartoon 5.
He has come to find out how many earthlings are alive.
For you see, the race of Fred
Wants all of us dead
For we are nothing more than annoyances.
They'll bomb us and blast us and mangle us too.
We're doomed you see, for there is nothing we can do.