he fuses to stuff

Swampfire in invincible,
then if they all fought at once, everyone would go for Waybig or Alien X, including Ditto, who would die trying to hold him, After many other deaths, they would finally take them down, including the death of Four-arms and Humangasaur.

Eventually through a long series of events and deaths, in would be down to Chromastone and Swampfire. Swampfire eventually being the winner.

MAYBE GRAY MATTER LOL

I can't choose!!!!!

Every alien is strong except of Grey Matter, but Grey Matter is so intelligent that he does not need strength to to outwit others

who can destroy Goop?

Alien X would just stay still as always, Way Big could wipe most of these out with one swipe

what ursonice said.

why way big ? alien x can do anything he also can make way big small with a blink of an eye

I thing ghostfreak would win, because he can posess other's bodies. But i think, that upgrade and ditto also have chance to win.

I’m disappointed in all of you. There’s no competition. Alien X could crush all of them in one move!