A for Andromeda (1961)

In the not-too-distant future of 1970, a mysterious signal from space arrives with instructions to build a powerful super-computer. Once completed, the evice's motives provokes discourse between scientists John Fleming and Madeleine Dawnay as further instructions are to create a living organism, which Dawnay develops. The entity compels lab assistant Christine to commit suicide, and, upon manifestation, adopts her form, now known as Andromeda.