Rikki Tikki Tavi is found by Teddy and his family. He learns to live with the humans, and finds out about the evil cobras Nag and Nagaina.

Rikki meets Chuchundra the muskrat, saves Teddy's family from Nag and finds the cobras' eggs.

Rikki faces Nagaina for the final time, and saves Teddy, his family and the garden from the evil cobras.