Naruto Smith is the gigantic biological offspring of Summer Smith and Morty Smith, born from one of Rick Sanchez's experiments that went wrong. He is nicknamed the "Giant Incest Baby", and later the "Giant Incest Monster".
Later prior to Gotron Jerrysis Rickvangelion it was revealed that he was captured by the government and taken to a secret base on Mars where Summer was abducted by agents in order for her to help them make Naruto into a human weapon, but upon spending time with him, Summer bonded with her son and helped him escape. Later Summer, Along with Morty, Jerry and Beth rode on to Naruto in order to save Rick when the previous owners of the Gotron Ferrete attempted to reclaim their rides and kill Rick, only for Naruto to defeat them and save his Great-Grandfather.
He is a gigantic, red-haired child (the same color as Summer), with one right eye bigger than the left. He has chin length hair and light skin. He has broken cuffs around his right wrist and left ankle after escaping a United States government facility.
- In the episode "Gotron Jerrysis Rickvangelion", Summer names him Naruto after helping him escape from Mars.
- His name is a reference to Naruto Uzumaki, the main protagonist of Naruto and Naruto: Shippuden.
- It is unknown how he is able to survive in space.
- This might be because of the processes that mutated Morty's sperm and/or enlarged Summer's egg.
- He is the second son of Morty after Morty Jr. whose fate remains unknown.
- Rick appears to like his new great grandson.