Alien

Alien is a 1984 strategy/adventure game developed by Concept Software and published by Argus Press Software. It was released in 1984 for the Commodore 64 and ZX Spectrum, and later ported to the Amstrad CPC in 1985.

An alien is lurking somewhere within the spaceship Nostromo. The alien has hatched from the body of one of the seven crew members on board, but can the other six crew members kill it in time, before the ship returns to Earth or their oxygen supply runs out?