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Cally was the only alien amongst the original crew, a native of the planet Auron. She left her home world to help the resistance fighters on Saurian Major and was subsequently exiled by her isolationist people. When a chemical poison was dropped on the rebels, she was the only survivor and was determined to make a suicide attack on the base until she met and joined with Blake. She was initially ashamed to return to Auron because she was the only survivor of the resistance.
Cally was the only member of the original seven who was not a convicted criminal. Like other members of the Auron race, Cally was telepathic and her psychic abilities were a great asset to the crew. On the other hand, it occasionally made her susceptible to being taken over by telepathic influence ("The Web," "Shadow," "Sarcophagus"). While her initial role was monitoring communications, she eventually became a skilled medic and pilot. Initially as fanatical as Blake in fighting the Federation, she became the moral "conscience" of the crew, once even questioning Blake whether destroying Star One was worth the suffering that would result. While she was rather distant and philosophical at first, as the series went on she became more connected to the crew and would display a dry wit on occasion.
Tragedy eventually marked Cally. Servalan, in a gambit to have herself cloned, deliberately infected Auron with a disease to which she alone had the cure. Almost all of the Aurons were killed, including Cally's twin sister Zelda. Cally herself was later killed by Servalan's explosives on Terminal, calling out to Vila with her last thoughts. Avon confirmed her death after returning to the ruined tunnels.
During the show, a romantic attraction was often teased between Avon and Cally. The first indication of this was during the episode "The Web," when Cally tells Avon, "I'm interested in your work," and the two share a long, lingering glance (that also has the humorous side effect of making the normally unflappable Avon somewhat speechless). However, an actual romantic relationship between the two was never explicitly shown during the series. The closest they came to a romantic interaction was during the episode "Sarcophagus" when Cally's body was taken over by an alien lifeform seeking a host through which to live again. The alien tried to win Avon over (the only crewmember not intimidated by it) by telling him, "Cally liked you," and that he could be at her side. Avon went so far as to kiss the alien (again, who was using Cally's body) in a ruse to gain its confidence and defeat it, freeing Cally in the process.
Similar references were made throughout the series; in the episode "Voice From the Past," Blake (under Federation mind control) fools Vila by telling him Cally and Avon have "paired up," which Vila quite readily believes. A slightly more bitter note is shown in the episode "Children of Auron"; when Cally reveals why she has never returned to her homeworld, she quite pointedly snaps, "Why do you imagine I've never gone back...affection for him?" at which point she storms off (and the other characters look towards Avon).
Cally and Avon quite often went on missions together and shared a knack for delivering quick-witted replies to the other's statements, which would somewhat indicate a growing affection for each other. However, Avon quite openly disdained her compassionate nature and her idealism, which he found to be only somewhat more tolerable than Blake's. Similarly, Cally at times openly mocked Avon's "cold" nature and often clashed with his more self-serving instincts. At one point during the episode "Horizon," Cally and Avon are the only two humans left on board the Liberator, and Cally pointedly rejects Avon's idea of leaving together (and the others to their fate). During the episode "The Keeper," Avon takes the ship out of orbit (and teleport range, leaving Blake, Jenna and Vila stranded in a moment of trouble) to blast Travis' ship, thinking Travis is on board. When Avon later attempts to do the same to what he believes is Servalan's ship, Cally flatly refuses, reminding Avon of what happened last time.
It was originally intended that Cally would wear black contact lenses to make her look more alien.