The Square Peg

A cheeky, stubborn roadmender who stirs trouble at the army camp and becomes an accidental wartime hero. His improvisational wit lets him survive a dangerous masquerade as a German commander. He falls for Lesley Cartland and, through a combination of luck and nerve, helps rescue prisoners before a dawn execution. After the war, he rises from mischief to mayor.

The ruthless German commander that Pitkin impersonates, whose theatrical bravado masks a brutal efficiency. He becomes the target of Pitkin's antics, culminating in a knock-out and a dramatic impersonation that alters the course of events. He is revealed to be the civilian Mr Grimsdale after the war, in a cheeky twist of fate. His presence drives the tension and slapstick throughout the mission.

An ATS officer who captures Pitkin's heart and who is involved with a local resistance group. Her cover is inadvertently blown by Pitkin's impersonation, leading to her arrest alongside the cafe owner. She remains a central romantic and political figure, representing courage under occupation.

The Borough Engineer who supervises Pitkin as part of the plan to train him for service. He ends up tangled in the improvised wartime plot and, after the war, reemerges as the civilian Mr Grimsdale in the same office, revealing the comic twist of the narrative. His practical mindset contrasts with Pitkin's chaos.

The camp sergeant who oversees Pitkin and Grimsdale's training, a figure of discipline who has a personal history with Pitkin from a past prank. He anchors the military environment that fuels the farce and keeps the pace tight with drill-like rhythms.

The opera-singing girlfriend of General Schreiber, a flamboyant personality who adds theatrical flair to the scenes in the chateau. She creates dramatic tension and is central to the double-life comedy when Pitkin hides within Schreiber's rooms. Her reactions punctuate the farce.

Leader of the local resistance who works with Lesley Cartland. He teams up with Pitkin and others to break into the chateau tunnel and rescue the prisoners, only to face capture himself. He embodies the collective effort of civilians behind enemy lines.

The camp commander who orders Pitkin and Grimsdale up for service to exact retribution. He is the institutional face of the wartime punitive system and the reason the misfit duo finds themselves in unexpected danger and heroism.