Marc DuQuesne

Richard Seaton

Marc DuQuesne is Richard's primary antagonist, a brilliant and ruthless rival in both science and personal ambition.

Dorothy Vaneman

Dorothy and Marc are adversaries, with DuQuesne often threatening her and those she loves.

Perkins

Perkins is a subordinate and assistant to Marc DuQuesne, carrying out his orders.

Brookings

Brookings is a corrupt government official who collaborates with DuQuesne for mutual benefit.

Martin Crane

DuQuesne and Crane are enemies, with Crane opposing DuQuesne's schemes.

Margaret Spencer

DuQuesne views Margaret as an obstacle and sometimes a target in his conflicts.

Prescott

Prescott is a colleague or subordinate working with DuQuesne in his schemes.

Richard Seaton

Marc DuQuesne is Richard's primary antagonist, a brilliant and ruthless rival in both science and personal ambition.

Dorothy Vaneman

Dorothy and Marc are adversaries, with DuQuesne often threatening her and those she loves.

Richard Seaton

Marc DuQuesne is Richard's primary antagonist, a brilliant and ruthless rival in both science and personal ambition.

Perkins

Perkins is a subordinate and assistant to Marc DuQuesne, carrying out his orders.

Brookings

Brookings is a corrupt government official who collaborates with DuQuesne for mutual benefit.

Steel Becomes Interested

DuQuesne learns of Seaton's discovery and immediately plans to steal it for the World Steel Corporation, negotiating a high price for his expertise.

Steel Liberates Energy—Unexpectedly

Reads about the explosion, negotiates a contract with Brookings, and plans to steal Seaton's work.

V: Direct Action

Disguises himself as Seaton, murders two detectives, wounds Shiro, and steals plans and solution from Crane's safe.

VI: The Object-Compass at Work

Plans to kidnap Dorothy Vaneman and use a space-car to force Seaton to surrender the solution.

VII: The Trial Voyage

Referenced as a threat; Seaton and Crane take precautions against his potential interference.

VIII: Indirect Action

The antagonist, who kidnaps Dorothy and struggles to regain control of his ship after an accidental acceleration.

IX: Lost in Space

Remains calm and resourceful, sacrificing copper items to try to avoid the dead star, kills Perkins in self-defense, and expresses hope that Seaton will continue his work if he dies.

X: The Rescue

Pilots the fleeing vessel, initially resists but cooperates after rescue, engages in a power duel with Seaton.

Through Space Into the Carboniferous

Cooks for the group after the accident, is considered for astronomy work despite being a potential threat, and provokes Margaret's anger.

XII: The Mastery of Mind Over Matter

Participates in the mental struggle against the entity, contributing to the collective effort that forces it to retreat.

XIII: Nalboon of Mardonale

Observes the battle and suggests the Mardonales' power is electrical, not chemical.

XIV: Nalboon Unmasked

Remains a captive; interrupts Seaton's correction of Dunark's title, insisting Seaton is the Karfedix of Knowledge.

XV: The Escape from Mardonale

Comments on Dunark's silencer during the escape.

Bird, Beast, or Fish?

Asks about the ship's ability to withstand underground travel, and is listed as a witness on the marriage certificate.

The Invasion

Mans a machine-gun, narrowly avoids electrocution from a charged gun, and serves as observer during the first and third shifts.

XIX: The Return to Earth

Examines his treasure from Dunark, plans to become a money power, and escapes the Skylark via parachute over the Panama Canal.