Teenage Mutant Ninja Turtles: The Last Ronin is a five-issue comic book miniseries published by IDW Publishing between October 2020 and April 2022. The series was written by Kevin Eastman and Tom Waltz, based on a story conceived by Eastman and Peter Laird, with art contributions from Esau and Isaac Escorza, Ben Bishop, and Eastman.

The story follows characters from the Teenage Mutant Ninja Turtles franchise in an alternative future, wherein the last remaining turtle seeks to avenge the death of his brothers by killing the grandson of one of the Turtles' arch-enemies, the Shredder. Despite being published by IDW, it is unconnected to the IDW series' continuity and is set in its own universe, dubbed the "Roninverse". The story was based on an old story outline written by Eastman and Laird in 1987, before the former updated it with Tom Waltz.

The Last Ronin was both a critical and commercial success, earning widespread acclaim for its darker tone, narrative, central character arc, and use of varying art styles. It was followed by Teenage Mutant Ninja Turtles: The Last Ronin - Lost Years and Teenage Mutant Ninja Turtles: The Last Ronin II - Re-Evolution in 2023 and 2024. A video game and a film adaptation are both in development.

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