Submarine Patrol

A Brooklyn-born millionaire playboy who joins the Navy to impress Susan Leeds, bypassing training to become chief engineer of the S.C. 599. His arrogance gradually yields to responsibility as he earns the crew's respect and navigates a forbidden romance with Susan. He ultimately risks the mission to secure his future with the woman he loves.

Daughter of Captain Leeds, she works on her father's freighter Maria Ann and becomes Townsend's love interest. She defies her father's orders by continuing the relationship, then supports Townsend's decision to marry despite wartime obstacles. Her loyalty to Townsend sustains the romance through upheaval.

Susan's father, a stern sea captain who disapproves of Townsend and tries to keep his daughter away from the risky romance. He confronts Townsend with fists and tries to protect his daughter from danger. His authority and sense of duty clash with Townsend's audacious ambitions until the mission tests them both.

A seasoned officer who has to redeem a past failure by commanding the 599 and enforcing discipline among the crew. He earns the crew's respect, coordinates the convoy escort, and leads the crisis against the U-boat. His leadership and courage underpin the mission's success.

A veteran seaman who serves as a mentor figure for Drake's crew and helps maintain order aboard the 599. He embodies the wartime spirit of camaraderie and duty, supporting Townsend and the men when the pressure mounts. His experience anchors the ship's morale.

A seaman nicknamed 'The Professor' whose caution and curiosity contribute to tensions aboard the ship, including a false alarm. He underscores the thin line between vigilance and panic at sea. His presence adds a layer of intellectual curiosity and undercuts bravado with moments of doubt.

A character connected to the social scene and to the ship's human element, included among the cast. She appears in scenes that reflect civilian life intersecting with wartime service, underscoring how love and relationships persist beyond the military setting.