Dr. Ghost makes his debut in the episode, "Seven Days to Terror" and is also featured in "Target, 8th Man" with Agent Byrd.
In the episodes "The Threat of Disaster", and "The Atomic Ghost" the Black Butterfly Gang seem to be leaderless, except for a man named, Mr. Karsh, the overseer of Mr. Barret - the "Ghost".
Black Butterfly Gang members are all indentifed by a small tatoo of a black butterfly (what else?) on their wrists. The Black Butterfly Gang attempts to destroy 8th Man in the first episode they appear in; then in subsequent episodes they want to capture him, so they can sell him for big bucks.
