Paper Tiger is a 1975 British drama-adventure film starring David Niven and the child actor Kazuhito Ando, who later portrayed Teru Tendou in Ganbaron.
He informs strangers he is the son of a viscount, a Member of Parliament, and a nephew of a general, and walks with a limp and cane which he says is due to crashing in the Le Mans 24-hour race.
The Ambassador is forced by the host country to deny the kidnapper's demands, which aim to exchange 65 political prisoners for the lives of Koichi and Bradbury.
While imprisoned, an ailing Bradbury reveals to Koichi that his limp is due to polio rather than to wartime service, but nevertheless the two contrive an escape from their hillside prison.
They blacken their faces (but not their clothes) and escape during the night, stealing a car which Bradbury drives recklessly down the zig zag mountain road until they crash.