In colonial India, a group of British soldiers faces a daunting mission: to dismantle a terrifying cult led by a feared Indian leader who has been terrorizing the local population. The plot revolves around a trio of British sergeants: the brave and charismatic Dan Cotton, his strict officer and companion, Sergeant Archibald, and the ever-optimistic yet clumsy Gunga Din, a native water-bearer who dreams of becoming a hero. Though initially skeptical about his usefulness, Gunga Din earns a place in their hearts as the story unfolds.
As the soldiers face betrayals and challenges in the context of the struggle between colonizers and insurgents, Gunga Din emerges as the true hero. Despite being just a water-bearer, his courage and determination shine in the most difficult circumstances. As they venture deeper into the jungle, the group discovers that the cult is closer than they thought, and they must join forces to prevent an impending massacre.
Through thrilling action and sharp humor, the film illustrates the power of friendship beyond cultural and racial differences, with the courageous Gunga Din demonstrating that heroes can come from any corner of the world. In the end, his sacrifice seals an unbreakable bond between colonizers and natives, challenging the conventions of his time.