The GateKeeper - Gon, The Invader
Updated: May 21, 2020
Gon is an intelligent being from a different world that had attempted to invade Earth through a gate (a portal) that links the two world centuries ago. Although he had brought an army of forces for the invasion, the majority of it was killed as it was passing through the gate due to an unknown malfunctioning. After the expected defeat, Gon was imprisoned underground and was forgotten by the earthlings. In the present day, Gon succeeds in breaking out of imprisonment and finds out that the only way back to his own world is through a young earthling that he encounters.