<Li> Halston Sage as Lieutenant Alara Kitan, the Orville's 23 - year - old Chief of Security . She is a member of the Xelayan race, which inhabits a high - gravity planet, giving her greater - than - human strength, allowing her to knock down doors and walls by charging against them, or crush a handheld cube of solid titanium and reshape it into a sphere with her bare hands . </Li> <Li> J. Lee as Lieutenant John LaMarr, the navigator of the Orville . He and Malloy strike up an immediate friendship in the pilot, based on their ironic view that they are both "jerks". </Li> <Li> Mark Jackson as Isaac, the Orville's Science and Engineering Officer . Isaac is a member of the artificial, non-biological race from Kaylon - 1 that views biological lifeforms, including humans, as inferior . Isaac explains to Mercer in the pilot that the Union's Admiralty offered a posting to any Kaylon willing to accept it, as an attempt to initiate relations between the two powers . Isaac accepted the offer because he saw it as a way to study human behavior . During the course of his time with the crew, he comes to observe and understand aspects of human behavior, such as sarcasm, slang, and practical jokes . Isaac perceives his surroundings with his body's internal sensors, and not with the two glowing blue "eyes" on his face, which are purely aesthetic . </Li> <Ul> <Li> Victor Garber as Admiral Halsey, Mercer's superior and an old friend of Grayson's father . He first appears in the series premiere and again in Episode 9 . </Li> <Li> Chad Coleman as Klyden, Bortus' mate and father of their child . He first appears at the end of the series' second episode . </Li> <Li> Norm Macdonald as the voice of Yaphit, an amorphous, gelatinous Engineering crew member of the Orville, who in his first few appearances, repeatedly attempts to obtain a date with Dr. Finn, and frequently flirts with other females on the ship . </Li> <Li> Larry Joe Campbell as Lieutenant Commander Steve Newton, Chief Engineer of the Orville . </Li> <Li> Rachael MacFarlane as the voice of the Orville computer . </Li> </Ul>

Who does the voice of isaac on the oroville