Mar 4
Other character appearances in the Two Doctors of Darkness movie. There are probably others in the background and such, but this post is for characters specifically shown and featured in the movie.
Goa from "Ambassador Magma" as Daedalus
Ham Egg, Tawashi, and Geta(?)
Cuzco from "Good Morning Cuzco!" as the worried mother.
Dr. Midoro from "Microid S".
Acetylene Lamp as Detective Takasugi, a recurring character in Black Jack.
Daisokan from "Zero Men" (or "0 Man")
Lord Earth from "Ambassador" Magma as Mr. Goodman
Biwamaru from "Dororo" as himself, also a recurring character.
Dr. Frankenstein as Hyojisai
Prof. Osakabe from "Run Away Tanker" / Daibousou Anthology as "Hakase".