The Dark One
Grand Emperor Dark Visor
Daz Dynamo
The Death Egg
Death-Trap
The Delta Ray Machine
Derek Wombat
The Desert Of Eternity
Diamond Mine Zone
Robotnik's Dimension Blender
The Dimension Bridge
The Discriminators
Doctor Robotnik Appreciation Tribe (DRAT)
The Doom Seed
The Dragon
Planet Drak
The Drakon Empire
Drakon Prosecutors
DRAT's Island Headquarters
The DRAT Tank
The Driller
Grimer's Duplication Machine