Kabir Khan's The Forgotten Army will trace the making of the Netaji Subhas Chandra Bose-led Indian National Army, the Indian military wing formed by Indian prisoners of war who were captured after the fall of Singapore. Since a large portion of the story plays out in Singapore of the 1940s, the director recreated parts of the island city-state in Mumbai.

"While we shot the scenes of current-day Singapore in the country itself, the grandeur of old Singapore had to be recreated in Mumbai. [We did so] with the help of archival footage and cutting-edge technology," says the director proudly, adding that his team scoured through extensive archival footage available as part of pre-production. "In fact, we have used some of that actual footage in the show."