Kishnar is a god-like monster and a villain in The Real Ghostbusters cartoon series. Kishnar's name is an anagram or a corruption of the name of the Hindu god Krishna.
According to Sumerian folklore, Kishnar is the master of earth and fire. He appears every 1,000 years to do battle with Anshar to determine who would rule the Earth.
Kishnar and Anshar knew that since they were immortal, neither of them die, but they fought for supremacy anyway: as a result their battles always ended in a draw and that, ironically preserved the natural balance of the world. Eventually, Anshar had the idea that they possess two humans to fight to the death, determining who would win.
When the Ghostbusters were stranded on their island, Kishnar possessed Ray Stantz and Anshar possessed Peter Venkman.
Whenever Ray and Peter got angry or started to fight (escalating their negative energy in the process), they would transform into corporeal manifestations of Anshar and Kishnar. The remaining Ghostbusters must keep the two from destroying each other to prevent the apocalypse. Two demons were eventually defeated when the other Ghostbusters kept them from fighting one another until sunrise, causing the two demons to go dormant for... another 1,000 years.