Author's note : I feel lucky and blessed to write the janma katha of Lord Vishnu as Krishna...
The episode started with Kangsa trying to kill his sister devaki's sons. He did not even spare a single child. His sister pleaded and reminded him that it was the 8th son who would be the reason for his death but not others. But Kangsa did not listen to them and killed their sons one by one.
Pandavas were shocked to hear what happened to Krishna's brothers from him. Krishna told when one commits a sin he tends to do more sins and human forget to see what is right and wrong. But nature has it's capacity to bear sins and finally the samaj decided how much they can take.
Krishna's elder brothers sacrified their life in order to keep the samaj clean he told.
Krishna then started narrating the story of his birth. When all the six children were brutally killed by Kangsa it was the time for the ultimate power to take birth.
Deevaki was scared and confined to Vasudeva and asked him to make sure her 8th Son lives and Vasudeva told her that for the betterment of this world and to remove adharma their 8th son will be born. Deevaki felt unconscious when Vasudeva saw the celestas took their position and the made the time appropriate for Narayana enter the world.
Kangsa ordered his soldier to keep an eye on Devaki and to inform him immediately once the son was born or else he will separate his head from his body.
Devaki was in labour when she saw a peacock feather which changed into Lord Narayana. Devaki as well as Vasudeva was shocked to see God in front of him. Vishu chanted his dasa avatara in front of them and told the purpose his rebirth. He told when love turns into war and king takes undue advantange of his men he comes in this world to eradicate such things. He also told them that they have suffered enough and now he would enter her womb and asked them to accept him as their son.
And then Lord Krishna was born.
Precap : Vasudev takes his son to Gokul and Vasukhi naag helps him.