one day the Bad Sanses found a basket on their door step they find it was a baby, they took it to their Boss Nightmare

Horror: "hey boss, we found this thing outside"

Dust: "it’s a baby"

Killer: "Error has it distracted for now"

Nightmare examined the a baby and spoke

Nightmare: "let’s keep it for now"

the other Sanses were surprised he wanted to keep it but they followed Nightmare’s command

Error: "so what do we do with it now"

Error was holding the baby with his strings