- A psychoactive drug, psychopharmaceutical, psychoactive agent or psychotropic drug is a chemical substance that changes functions of the nervous system, and results in alterations in perception, mood, cognition, and behavior.
- Atari 2600: Missile Command (Internet Archive)
Aliens from the planet of Krytol have begun an attack on the planet Zardon. The Krytolians are warriors out to destroy and seize the planet of Zardon. Zardon is the last of the peaceful planets. The Zardonians are skillful and hardworking people. Their cities are built-up and rich in resources. It is truly a planet void of crime and violence.