Rikki-Tikki-Tavi, a mongoose, was swept away from his burrow by a flood and is rescued by a young boy named Teddy. They found him almost dead by the river, and the human family decides to adopt Rikki and give him a nice home because he was all alone.
As Rikki-Tikki-Tavi explores the families bungalow garden, he comes across two mean cobras, Nag and Nagaina, whothreaten to hurt him and his human family. They also threaten to to kill all of the other animals in the garden so that they can take over the whole place.
This is where Rikki-Tikki-Tavi becomes enemies with Nag and Nagaina and they fight. Rikki wins, but the cobra couple doesn't like that.
Nag starts to come up the bathroom drain and then decides to take a nap. Rikki took that opportunity to pounce on him, but then Teddy's father heard some commotion and fired his gun right at Nag, causing Nag to die.
Nagaina gets really mad because her husband is dead, so she got furious and attacked Rikki, as well as his family. She targets Teddy threatening him as well as everyone else.
Rikki-Tikki-Tavi destroyed Nagaina's eggs while she was in the bungalow and used one against her to lure her out. Rikki told her to never come back again but she then got away. She slithered into her little burrow and hid. Rikki was scared, but he followed her in there. Everyone was scared because there was no movement from the grass above, but then Rikki emerged from the ground and announced that Nagaina was dead, and that everyone was safe again!