A Larren is a large cyclopic creature which inhabits the moon of planet Psychon, where the atmosphere is very thin. It survives there by storing oxygen within its body; similar to how a camel stores water; and its skin has properties similar to those of a spacesuit. It's also very strong physically.
When Psychon shapeshifter Maya transforms into this species, she is capable of operating in the airless environment of the Earth's moon without protection.
- Space: 1999, s02e19, "The Bringers of Wonder, Part 2" (1977) (transformation only)