Rikki Tikki Tavi got washed away during a flood that occurred one day, but after this family of 3 picked him up and took him home knowing he wasn't alive and was shocked when they found out he was.
The family and Rikki Tikki overheard the snakes plan of killing them.
Rikki Tikki was outside with Nag and they both went after each other, they fought and Rikki Tikki bit his tail and won the fight.
Even though Rikki Tikki killed Nag, there is still Nagina. They make a plan to go and kill her so they could all be safe.
Rikki Tikki went to where Nagina was and tried to kill her but she got to Tommy and Rikki Tikki got to her eggs before she did. They threaten each other to kill each of them but Rikki Tikki ends up killing Nagina before anything happened.