When you watch Doctor Who Season 10 Episode 12 online, the Doctor decides to put Missy's apparent reformation to the test. A field test, to be specific. He sends Missy, Bill, and Nardole out to answer a distress call from a colony ship that had a close encounter with a black hole, but it's a very short time before they run into trouble when one of the crew shows up. He reveals that he's the only member of the crew left, the others, all human, having been dragged off below decks by unknown monsters that apparently have no interest in him. Incredibly agitated and waving a gun, he demands to know if any among them are human, because the monsters only come when they detect human life signs. But who are these creatures, and why are they only interested in humans? Despite the Doctor's immediate concern about the situation, the whole mess deteriorates so fast that an unexpected tragedy strikes, despite his best intentions and any action he could take. With such a grave outcome, and an unknown enemy, is there anything the Doctor can do to fix the situation? Or will this spell the end for them all? Find out what happens when you watch Doctor Who Season 10 Episode 12 online!