Nikola Tesla's Night of Terror (S12E04)

In 1903, amidst the thunderous roar of Niagara Falls, Nikola Tesla's generator plant is under threat from an unknown saboteur. As Tesla grapples with the possibility of receiving communication from Mars, the situation intensifies with the looming presence of his fierce competitor, Thomas Edison. The Doctor, along with Yaz, Ryan, and Graham, must collaborate with the brilliant inventor to thwart the impending disaster and protect both Tesla and the future of Earth.