A humanoid species with heavily folded, drooping facial skin, glimpsed among the crowds of Starfleet Headquarters and the Enterprise crew in Star Trek: The Motion Picture, and never given a line of dialogue.
The Arcturians are one of the batch of new alien species created to fill out the Federation in Star Trek: The Motion Picture. They are humanoids whose faces appear to sag in deep, waxy folds, as though the skin had partly melted.
They can be seen in the film's San Francisco scenes and again among the assembled crew on the recreation deck of the refitted Enterprise, when Kirk shows his people the recording of V'Ger destroying the Epsilon IX station. None of them speaks or is named.
Almost everything else said about them comes from behind the scenes. Costume designer Robert Fletcher wrote notes for each of the film's new aliens, and his sketch of the Arcturians imagined them as a people of clones who supplied the Federation with infantry. Nothing of that idea is stated on screen.