So I’ve actually had an idea for how Steven Universe and Slugterra could be in the same world as each other.
We all know about the Kindergarten, and about how Earth was used as a planet for the production of Gems that were incubated within its crust. My question is: would it be possible for these incubating Gems to have sucked away at the ground and left large hollows?
And then after the war, Rose Quartz travels down to see the destruction that was caused and decides to bring some plants and maybe a few humans down there to try to heal the earth (and maybe some creatures that were mutated by gems somehow).
The Lumino Ore and the glowing crystals we see in Slugterra are actually stillborn Gems that died during incubation and/or failed to emerge and all the strangely magical plants were bred by Rose for life in the caverns (it also raises the possibility of Rose trying to help contain the Darkbane, who would’ve been unleashed had Homeworld succeeded in their plans for Earth).
I dunno, what do you guys think?