The Treens are fictional aliens in the Dan Dare stories. They first appeared in Dan Dare: The First Story, which was serialized in the Eagle comic magazine from Volume 1, Number 1 (April 14, 1950) to Volume 2, Number 25 (September 28, 1951). The story was drawn by Frank Hampson.
The Treens are a race of green-skinned humanoids from the northern hemisphere of the planet Venus. The southern hemisphere is inhabited by the Therons, a human-like race with an obvious affinity to humanity on Earth. The Treens share the northern hemisphere with the Atlantines, a blue-skinned people whose ancestors came from Earth 100,000 years previously. The two hemispheres are separated by the "flamelands" around the equator which are impassible, except by specially equipped aircraft.
The leader of the Treens is the Mekon, an individual specifically engineered to have a high intelligence. The Treens are portrayed as mostly unemotional without the usual human feelings about the sanctity of life. In ancient times, they lived as savage jungle tribes permanently involved in tribal wars amongst themselves, until in a major war the Therons occupied the northern hemisphere by force in an attempt to civilize the Treens. The attempt failed and the Therons later abandoned the Treens to their own devices.
Soon after, Treen scientists created the first Mekon as a "super-brain" to rule over the Treen race. The Mekon developed Treen society into a highly organized militaristic logic-based society where orders are obeyed without query, and which is usually in a state of hostility with the Therons and Earth, both of whose lands they have on occasion occupied. Their capital city is called Mekonta and is on islands in a lake. The Atlantines are usually ignored by the Treens, and live in primitive conditions.