Arcturan

Arcturans were a species of aliens which resembled a skull with tendrils spreading out.

Technology
In order to survive outside their own planet, the Arcturans required life support systems. The most vital system was the helium regenerator. (DW: The Curse of Peladon) These systems would range from simple boxes with a necessary equipment to advanced systems capable of travelling and surviving nearly anywhere. (NSA: The Doctor Trap)

Culture
Though the Arcturans knew of the Doctor, records of him were scarce.(NSA: The Doctor Trap) They were known for being profit-obsessed and self-serving. (EDA: Interference - Book One) The Arcturans were also known to make tea. (NA: Lucifer Rising)

History
The Arcturan Treaty of 2085 was once said to be the first official instrument of peaceful contact between Humanity and aliens. (NA: The Dying Days)

At some point after settling Cluut-ett-Pictar, the planet was attacked by an Arcturan strike-force. (NA: GodEngine)

In 3885, Peladon was attempting entry into the Galactic Federation. In the original timeline, the Arcturan delegate Arcturus killed Alpha Centauri and blamed the Ice Warriors, sending the Federation into chaos. (NA: Legacy') The Time Lords intervened and sent in the Doctor, who was chosen as the target and saved by Ssorg. (DW: The Curse of Peladon)

Undated Events

 * The Semblance of Draxyx was an Arcturan and a member of the Endangered Dangerous Species Society. He was one of the member who arrived and was killed on Planet 1. (NSA: The Doctor Trap)
 * The Doctor once reminisced about the time he, Rose Tyler and an Arcturan shared an experience in a cellar. (NSA: The Day of the Troll)