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Professor Prepostera is a horse Category:NPC Toon scientist of Loony Labs along with Professor Flake, Doctor Dimm. and Doctor Surlee. He, along with Doctor Dimm, hasn't had any speaking roles in Toontown Rewritten (yet), his blog post about The Gray aside. He, along with Doctor Dimm, made a small cameo during Doomsday, inspecting Slappy's campgain stand.
- He was the leader of Loony Labs and the scientist in the spotlight in Toontown Online. These positions were taken by Doctor Surlee in Toontown Rewritten.