Dr. Daystrom doesn't want to become an inmate on Elba II

M-5 detects the Woden, an unmanned freighter that is not part of the test, and attacks with real weapons, destroying it. Shocked by this, Captain Kirk orders M-5 taken offline, but Dr. Daystrom continues to believe it is working correctly, and refuses, saying that he doesn't want to become an inmate in the insane asylum on the planet Elba II, where Dr. Janice Lester and Garth of Izar are.