VIDEO : It Turns Out There's A Prequel To 'How the Grinch Stole Christmas'

Not many people know that there is actually a prequel to the Dr Seuss festive classic ?How the Grinch Stole Christmas.?
According to Business Insider, the prequel story is called ?Halloween is Grinch Night,? and first aired as animated TV special for Halloween 1977.
Much like the Christmas tale, "Halloween is Grinch Night" tells the story of the Grinch terrorising the Whos of Whoville.