Agent X II: The Mad Prof's Back is the follow-up to the ZX Spectrum game Agent X.
The player takes control of the eponymous Agent X in a multi-load game made up of a number of sub-games.
The mad professor has returned, seeking revenge after Agent X foiled his plan to brainwash the President. This time he is out to ruin the world economy. He has set up an underground base on the Moon. From this hideout he plans to unleash his terrible Zit-Ray, a device that causes everybody to break out in terrible terminal acne. The mad prof plans that, with spending so much money on spot remover cream - which, due to the terrible effects of the Zit-Ray, will not work anyway - the economy will be in ruins, as no-one will have any money left for essentials. Agent X must travel to the moon, surprise the scientist, and destroy the zit-ray.
Source: Wikipedia, "Agent X II: The Mad Prof's Back," available under the CC-BY-SA License.