Argolins were humanoids with intricate green and yellow hair. As infants their skin colour was close to humans. but they swiftly developed a yellowish-green colour.
After the war with the Foamasi, the Argolin became sterile and their metabolism changed. They had small horns covered in nodules on the tops of their heads. These nodules fell off as the Argolin aged. When the last nodule fell off, they would decay rapidly and soon die. (TV: The Leisure Hive)
The Argolins were united by Theron, who used force and warfare. He declared war on the Foamasi, who bombed Argolis with nuclear weapons, ending the war in twenty minutes and devastating the planet.
In the wake of the war, the Argolins turned towards recreation, using tachyons for regenerative processes. Twenty years after the war had ended, they developed methods to create new Argolins, combining cells of surviving Argolins. They created a new Argolin, Pangol. (TV: The Leisure Hive)
An individual who may have been an Argolin was present at Iceworld, which would suggest that the Argolin eventually found a way around their sterility. (TV: Dragonfire)