"Monster Masquerade" is the seventeenth episode of the third season of Roger Ramjet. It originally aired on October 7, 1965.
Roger Ramjet ends up getting an invitation to a masquerade party as Castle Eerie out on the shore of Lake Erie. But little does he know that Dr. Frank N. Schwein was the one who invited him, and the other "party guests" are actually an entire society of monsters. Can the Eagles rescue him?