Here is a comprehensive summary of the Reacher Wikipedia article:

Reacher is an action-crime television series on Amazon Prime Video, developed by Nick Santora and based on Lee Child's best-selling novels, starring the physically imposing Alan Ritchson as the wandering former U.S. Army military police officer. Each season adapts a different book from the series, with the first season (Killing Floor) premiering in February 2022, the second (Bad Luck and Trouble) in December 2023, and the third (Persuader) in February 2025, all following Reacher as he investigates corrupt conspiracies, arms traffickers, and dangerous enemies while traveling across America. The show has been renewed through a fifth season—based on Make Me—with the fourth season (adapting Gone Tomorrow) premiering on August 12, 2026, and a spin-off series focusing on Maria Sten's fan-favorite character Frances Neagley set to debut in September 2026. The series features a rotating ensemble cast of recurring allies and formidable antagonists each season, including original partners like Officers Oscar Finlay and Roscoe Conklin in Season 1, and the returning 110th Special Investigations Unit members in Season 2. Praised for its faithfulness to the source material and Ritchson's towering, capable performance, the show has solidified itself as a major action hit on the streaming platform, exploring the drifter's intelligence, strength, and military prowess as he takes down ruthless criminals.