Demogorgons

"This article is about the species. You may be looking for the monster who invaded Hawkins in 1983 or the monster kept in Kamchatka."Demogorgon is the name given to the monster species of the Upside Down by Will Byers, Mike Wheeler, Lucas Sinclair, and Dustin Henderson.

Slug
The "Slug" is the larva stage of the Demogorgon. Two larvae have been pictured in Stranger Things: first, the larva that was on the corpse of Barbara Holland and second, the larva that Will Byers choked up and then washed down the drain in his bathroom sink.

Pollywog
The "Pollywog" is the second stage of the Demogorgon. At the pollywog stage, D'Artagnan was found by Dustin Henderson in his trash can.

Frogogorgon
The "Frogogorgon" is the third stage of the Demogorgon. Unlike other stages, the cycle is entered by the change of the creature's skin color from a yellowish color to something like a dark green color, whereas with entering the other stages, the creature molts. It also grows two more legs; the number of legs increase from two to four.

Catogorgon
The "Catogorgon" is the fourth stage of the Demogorgon. The Catogorgon stage is entered through molting. It develops its "flower-petal mouth" with it carries the rest of its life. Also, the species develops a darker skin color and becomes able to walk in direct sunlight.

Demodog
At the "Demodog" stage is the Demogorgon's penultimate stage of its life cycle. It is now about the size of a large dog. It has the strength to tackle an adult human. A Demodog's skin is thick enough to resist several gunshots.

Name Etymology
Dustin calls this stage "Demodog" because "Demo-" (as in Demogorgon) + dog (because of its size). Demodog.

Demogorgon
This is the sixth and final stage of the Demogorgon. The Demogorgon is now a biped and very strong.