Harpo Marx

Harpo Marx was an individual who physically resembled the Fourth Doctor. The Doctor was once derisively called a "reject from the Harpo Marx lookalike contest" by Stephen Fontaine. (PROSE: UNITed We Fall) In another instance, Richard Charlesworth thought he looked like a cross between Marx and Lon Chaney when seen in the dark. (PROSE: It's a Lovely Day Tomorrow)

Honoré Lechasseur compared Mestizer's henchmen Laurel and Hardy to the "ghoulishly silent" Harpo, as well as Groucho and Chico. (PROSE: The Cabinet of Light)

Behind the scenes

 * While their full names and relationship to Harpo Marx are not mentioned in the novel The Cabinet of Light, the Groucho and Chico referenced are Marx's brothers and fellow actors Groucho and Chico Marx.