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Xenon is a vertically-scrolling shoot 'em up loosely inspired by Xevious (Franchise) in which the player, as the futuristic pilot Darrian, must make their way through four sectors to save humanity from the Xenite alien race. The game was the first to be developed by The Bitmap Brothers, who would become renowned for their presentations. It was developed for the Atari ST in 1988 and soon ported to various other home computers. Xenon was followed by a sequel: Xenon 2: Megablast. Megablast dropped the shapeshifting aspect to the player's craft but expanded the number of power-ups on offer.
The goal of Xenon is to simply reach the top of the "sector" and defeat two bosses along the way: one midway through the sector and one right at the end. While not available in every sector, the player could transform their craft into a tank that was capable of moving and shooting in eight directions. The standard jet plane variant could only point and fire upwards. Both forms were often necessary to avoid enemies and collect power-ups: taking damage from shots was considerably less dangerous than colliding into enemies or walls. The boss of each stage is the Sentinel, a face-like robot that needs to be destroyed by removing its front-facing shielding and firing at its core. Each time the Sentinel is met, it adopts a movement pattern that is harder to elude/predict.
The game uses a letter-based power-up system also seen in Arkanoid (Game) or Contra (Game), where each letter represents what the power-up provides.