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 PROSE: The Cabinet of Light, the Groucho and Chico referenced are Marx's brothers and fellow actors Groucho and Chico Marx.