The nickname "Casey" comes from the film's production crew. Because the alien’s single eye resembled a "cauliflower" or the rounded shape of a baseball bat's end, and given the American love for the classic poem Casey at the Bat , the crew began calling the creature "Casey." The name stuck in the fandom.
The alien was designed by the legendary makeup artist Jack Kevan (known for his work on The Wizard of Oz as well). The suit was a full-body, scaly ensemble featuring a large, veined single eye that flickered. It was a brilliant piece of pre-CGI practical effects. Polar Lights Casey
: Generators are the primary power source, especially during winter, to keep lights and life-support systems running for approximately 30 overwintering Australians. Wind & Weather The nickname "Casey" comes from the film's production crew