H.Y.D.R.O.G.E.N. (Bramble's Conception)

The H.Y.D.R.O.G.E.N. is a small but significant blimp. It has only a measely 40HP, but don't let this fool you. Due to its incredibly light weight, it moves at a speed of 3.15 compared to the Red Bloon, being almost as fast as the Yellow Bloon.

However, it has a special quality. If you hit it with fire, explosions, or similar, the H.Y.D.R.O.G.E.N. will explode. This deals damage equal to its remaining HP to all nearby towers and Bloons. This can result in huge, devastating chain reactions. Additionally, it doesn't take any damage from the hit that makes it explode!

This blimp, despite being small, can be purely devastating in large numbers. It also releases a Speedy Speedy Speedy Grey Bloon (the electron), a Speedy Heavily-Armored Red Bloon (the proton), and occasionally a Speedy Heavily-Armored Slow-Down Blue Bloon (a neutron) too.