|This character exists primarily or exclusively within the Pre-Super Genesis Wave continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
- Doctor Niven was named after science fiction writer Larry Niven.
- In Sonic the Hedgehog #148, Doctor Niven and his associate, Professor Clarke, are referred to by Shadow as Overlanders. However, they lived before Overlanders evolved from Humans.