Although not shown, it is indicated that the first batch of MutaStones come from the Neutrino Kingdom in the first episode of the OVA Japanese offshoot of the franchise Mutant Turtles: Chōjin Densetsu Hen. The name Neutrino is illustrated in the context of an earthly shrine, connected to a lost culture of Earth, which the Mutastones created for the concentration of magical powers.