Castle (2009)

Episode Overview

During a training exercise for a mission to Mars, an astronaut is unexpectedly found dead within a Mars simulation, prompting Castle and Beckett to don spacesuits for a closer look. As they delve into the investigation, they realize that nobody inside the airtight simulation could have carried out the murder, and no one from the outside could have accessed the area. This revelation leads them down a surprising path in their quest for the truth.