Spock, the infamous half-Vulcan, half-human Starfleet officer, was known for his unwavering commitment to logic.
He often found himself at odds with the illogic of those around him, particularly his captain, James T. Kirk.
Illogical Decisions: Spock's Most Memorable
Spock's logic often led him to make decisions that, while seemingly logical, would later prove disastrous. His most famous being the time he turned his hair into a poncho in the middle of a battle.