Charlie Chan at the Olympics

The seasoned, observant detective who methodically unravels the conspiracy. Chan combines wit, patience, and practical cunning to outmaneuver dangerous adversaries. He remains a protective patriarch to his sons, guiding them toward justice with calm authority.

Lee is a bright, athletic young investigator whose curiosity and bravery complement his father's method. He navigates dangerous situations with courage and quick thinking, helping to uncover crucial clues. His partnership with his father strengthens the pursuit of the truth.

A glamorous passenger who becomes a focal point of suspicion. She uses charm and calculated moves to maneuver through shipboard and Berlin intrigues, keeping her true motives obscured until the twist reveals her role. Her dual demeanor drives the plot’s tension.

Hughes is a calculating arms dealer whose schemes escalate the stakes for Chan and colleagues. He manipulates others to reach his goals and avoids direct exposure until the climax. His greed and ruthless strategy mark him as a dangerous antagonist.

Hopkins is the inventor's associate and a central suspect who navigates corporate and political pressures. He becomes entwined in the plot as his connections to the stolen device come to light. His role blends authority with opportunistic self-interest.

Cartwright is the inventor of the radio device at the heart of the mystery. His credibility and loyalties are tested as the theft is uncovered, and he acts as a catalyst for the confrontation that resolves the conspiracy. He embodies the tension between scientific progress and its exploitation.

Zaraka is a diplomat whose ambitions intersect with the fate of the invention and the Olympic entourage. He exudes poise but reveals a willingness to leverage power to achieve his aims. His presence amplifies the film's international stakes.

Masters is an Olympian competitor who becomes embroiled in the intrigue due to the missing device and shifting loyalties. His role adds personal motive to the chase and a rival dynamic that intensifies the pursuit. He seeks a fair chance at the games amid the chaos.

Betty is Masters' girlfriend who offers support and insight to Chan and Lee. Her involvement reflects the collaborative spirit of athletes and investigators, contributing to the unraveling of the timeline and aiding in resolving the case.