Two Parallel Lives Shouldn't Meet
Michael Gallager (writer), ?Haller? (pencils and inks), Jacqueline Roettcher (letters)
Published in Count Duckula #12, 07/1990.
BG has learned of the existence of a negative world, a parallel universe where everything is backwards and good is evil and vice versa. He swaps the good DM for a very nasty looking evil one.