out of her contract, and rumors had circulated of her departure. She later described her time spent on Star Trek: The Next Generation as "miserable", and it was well known at the time that she was unhappy with the way her role had been developed. She later said that if she'd had more scenes written for her similar to the one she shared with Worf at the start of the episode then she wouldn't have wanted to leave the show. Yar's memorial scene was filmed twice, the first was with Crosby reciting the lines while looking straight ahead, which was the director's preferred choice. However a version with her looking towards each of the other characters in turn was ultimately used. Scanlan later said "Don't ask me how she knew where they'd be standing". Marina Sirtis's tears in the scene were real, as she was cued by Crosby standing off camera. "Skin of Evil" was not the last episode in the first season in which Denise Crosby appeared. "Symbiosis" was subsequently filmed after this episode, but was aired earlier in the run. Crosby would also later return to the Yar role in "Yesterday's Enterprise", the two part series finale "All Good Things..." and as Yar's half-Romulan daughter Sela in several episodes. Guest stars in "Skin of Evil" included Walker Boone as Leland T. Lynch, Brad Zerbst as a nurse and Raymond Forchion as Ben Prieto. Even though this episode marked the death of Yar, Crosby would be credited for the remaining three first season episodes. Creature effects Armus was originally intended to be based on the Mummenschanz theatre group style, but was discarded in favor of a "shroud" type creature. Director Joseph L. Scanlan was determined to make the creature believable, and it was aimed to have the creature rise up out of the oil slick, drawing it up with him. A test was made using a melting miniature figure of Armus with the intention to play it in reverse, but it didn't provide the required effect. The construction of the suit for Mart McChesney to wear as Armus was split between two teams. Michael Westmore and Gerald Quist spent a day sculpting the head, while the construction of the body was outsourced to an external company. McChesney as Armus was lowered into and out of the oil by means of a grate under the surface. Although the head was