A panicked Doc suddenly returned from the future year of 2015, 30 years later, and told Marty: "Marty! You""ve gotta come back with me!.Ethan continued to work - first manipulating the thermostat to keep the temperature stable, and then typing in Donloe""s password (dictated to him by Luther).In voice-over, he spoke as the medical operation commenced and he lost consciousness: "What is it that makes us human? It""s not something you can program.After he first wave of Stormtroopers were killed, a second battalion of reinforcements appeared with a two-legged Imperial walker.