Microcosm on 3DO is a first-person action game set in a futuristic universe. In 2051, two companies are engaged in a merciless war for supreme power. When the president of one of them, Anton Korsby, is injected with a virus, the last resort is to go into his body to destroy the infection from the inside. The player will have to find their way while clearing the place of malicious organisms and the virus that dominate Korsby's brain.