According to Sumerian folklore, Anshar is the master of wind and water. He appears every 1,000 years to do battle with Kishnar to determine who would rule the Earth.
Since the two gods were immortal, neither of them could die and as a result, their battles always ended in a tie and preserved the balance of the Earth.
Eventually, Anshar had the idea that if he and Kishnar possessed two mortals and fought to the death, one of them would win.
When the Ghostbusters were stranded on their island, Anshar possessed Peter Venkman and Kishnar possessed Ray Stantz.
Whenever Peter and Ray argued or got mad at one another, thus escalating their negative energy, they would transmutate into corporeal manifestations of Anshar and Kishnar. Egon Spengler, Slimer, and Winston Zeddemore saved the day by keeping the two from fighting until sunrise, causing Anshar and Kishnar to go dormant for another 1,000 years.
- Anshar is named after the ancient Akkadian god of sky.