Capt. Yates is likable and charming. He has somewhat of a potential for romance with Jo, but little comes of this on the series. He’s an able officer and his eventual complicity in a scheme to return the world to the time of the dinosaurs (due to concerns over the planet’s health) comes as a complete shock. This is one of the most effective twists in the classic series, demonstrating Mike’s determination (however misguided in this instance) to save lives and fight for the common good.