Dr. D. Zaster was a an associate of Dr. Inferno. D. Zaster planned to cover LEGO City with toxic slime in the Agents 2.0 set 4-Wheeling Pursuit. His plot was later foiled by Agent Chase. He looks similar to Slime Face.
- His name is a pun of disaster.
- He has the same hair piece as Dr. Inferno but in white and lime green as opposed to black and orange.
- He has a similar torso to Dr. Inferno, except it is black, has no robotic arm, and has slime oozing down from the top of the suit.
- It is possible that he is Slime Face, as in 8636 Mission 7: Deep Sea Quest he is wearing a diving suit, which the neck area is covered in slime. This can be concluded because Dr. D. Zaster has the same head as Slime Face.
- His head is a printed, lime green-coloured translucent element.
- In the LEGO Minifigure Sticker Collection Book , Dr. D. Zaster's description says "Dr. D. Zaster is an old friend of Dr. Inferno."
- In the theme, Dr. D. Zaster is a friend of Dr. Inferno but in The Robot Chronicles he appeared as a battle-damaged version of Dr. Inferno