Dr. Robotnik is an alternate version of Dr. Ivo Robotnik from Planet Freedom in an unnamed Zone who wishes to marry Princess Sara. Sonic and Tails did battle with him and his Metal Robotnik robot briefly after their Mobius was altered to resemble his dimension by the efforts of Chaos Knuckles. The restoration of reality ended this incident and possibly erased it from the minds of those on Mobius. (StH: #101)