The Prometheus Design is a novel from the Star Trek: The Original Series collection, authored by Sondra Marshak and Myrna Culbreath.

Enterprise arrives to assist the Helvans, who are facing a surge of violence, with revolutions, mass riots, and unimaginable tortures sweeping their planet.

Captain Kirk and his crew quickly realize that this chaos is no mere coincidence, but rather part of a sinister experiment controlled by an unimaginable power.

However, under Spock's leadership, the crew is disturbed to find his orders as irrational and cruel as the violence on Helva.

Unless this terrible power can be stopped, not only the Enterprise, but an entire galaxy may fall victim to the deadly design of Prometheus.