This is the first of three Halloween based stories and the debut of the villain Samhain. He will return in Halloween II 1/2 (1987), but not in the third and final Halloween set adventure, The Halloween Door (1989).
The voice actors were recorded on July 7, 1986.
Samhain received an entry in the 2016 tie-in book "Tobin's Spirit Guide - Official Ghostbusters Edition" on pages 68 and 69, where it is identified as a Class VII, with the ability to manipulate local environment and able to control lesser entities.
In 1997, "Sam Hain" was released as an action figure in Trendmasters Extreme Ghostbusters toy line. He also appeared in the opening and closing credits of each installment of Extreme Ghostbusters (1997), but was never featured in any of the stories.