Delta Theta III was the inhabited class M third planet of its system. It was the homeworld of the Delta Theta III aborigines, a Saurian species who were protected by an entity they regarded as their god, as it viewes the aborigines as its "children", and guided them in their evolution. The planet had rain forests and a northern continent.
A Federation scouting mission had reported the presence of a native population. The USS Enterprise, during a series of exploratory and contact missions in 2270, was ordered to investigate the planet. In that year, the planet's lifeforms appeared far younger than was geologically expected, considering the age of its primary.
After an assessment of the planet and its civilization, Captain James Kirk sent a message to Starfleet Command recommending that this planet be quarantined and that no Federation vessel, under any circumstances, should approach the planet. (TAS: "Bem")