Kukan (originally subtitled The Secret of Unconquerable China) is a 1941 American documentary film co-produced by Li Ling-Ai and Rey Scott, and directed by Scott about the Chinese resistance to Japanese aggression during the early part of World War II (see Second Sino-Japanese War). Though Ling-Ai served as co-producer and sponsor, she was credited as a "technical advisor" in its credits. In 2016, Robin Lung produced a documentary about Ling-Ai, Finding Kukan. Kukan is available as an extra on Finding Kukan's home release.