So, at this point most of the community knows that Eli's Boon Doc, Doc, is an elemental, but how can that be aren't they one of a kind? Unless it's an exception which I doubt, so here is my theory, the white boon doc, are regular boon docs, and the green one is the the only green, why? Simply because he is an elemental, we know that he is related to energy/psychic/eletricty slugs, so could that be that the White Boon Doc is simply a close ancestor, and there is in fact, only one Green, energy elemental slug? You could ask about The Goon, but we never actually seen how he was before he was ghouled, we only speculated that he would look like Doc, but what if he isn't? What if he was white? As elementals were not seen for millions of years, people could've forgot how they looked like and assumed that Doc was a variation. The only thing that can disprove this theory is a flashback of the episode "The unbeatable master" where Blakk is seen with a green Doc, but even so elementals have been around for millions, so who's it to say that that isn't Doc?