"Brian the Brain" is the ninth episode of the second series of Space: 1999 (and the thirty-third episode overall of the programme). The screenplay was written by Jack Ronder; the director was Kevin Connor. The final shooting script is dated 5 May 1976, with amendments dated 11 May 1976. Live action filming took place Tuesday 18 May 1976 through Wednesday 2 June 1976. Story It is 1150 days after leaving Earth orbit, and Moonbase Alpha is in the midst of a major project. Throughout their captive journey through space, the various scientific departments have each acquired tremendous quantities of data. This data is now being reviewed and uploaded to the Main Computer memory banks. While the Research Section concentrates on this endeavour, the non-scientific personnel are enjoying a bit of a rest. The relaxed atmosphere in Command Centre is interrupted, however, when Computer begins displaying new data indicating a gradual but increasing change in the Moon's trajectory. The data review is cancelled as the staff addresses this new development. Sensors cannot locate a gravity source and a 360-degree visual scan reveals no visible objects in range. Despite the lack of evidence, Computer insists the rate of change is accelerating—they are closing with whatever is pulling them. A horrifying question is raised: is the Moon being drawn into a collision course with a black dwarf? With time apparently running out, John Koenig orders an immediate evacuation. Transporter Eagles rise on the launch pads and flee as quickly as they are loaded. While coordinating the exodus, the Command Centre staff sights a celestial body at extreme range. After Computer sluggishly offers vague estimates regarding its identity, Maya calculates the object to be a small planet with a gravitational pull approximating the Moon's—insufficient to affect their course. With the instruments still unable to locate the gravity source, she questions Computer's reliability, wondering whether the course change is real...or false data resulting from a malfunction. Before they can investigate this possibility, the staff is distracted by the sight of a spacecraft streaking across the screen. To their amazement, it is identified as a Swift, an Earth vessel which pre-dates the Eagle. Eagles One and Two are dispatched from the evacuation fleet to intercept the mystery craft. After determining that the Swift is not the abnormal gravity source, they approach. When audio contact is established, the Swift's pilot hoots and hollers at the sight of