The Protost are a gelatinous alien species from the humid moon Myceto.
|Universe||Ben 10 Universe|
|Height||Height 1,90 meters (about 6 feet)
They are a very intelligent race of amorphous beings native to the moon of Myceto which apparently can't speak english, and as in Ben 10 almost all sapient aliens speak this language, this is very rare.
Their most notable hability is the capacity of completely reform their bodies from the smaller pieces (which suggests asexual reproduction), they also have a vision better than Human's and are one of the best races as engineers.