The Grinch, The Freak

Halloween is Grinch Night:

The Grinch later appeared in a few more specials, and although they weren't as popular as his original Christmas outing, they're well-liked among the viewers. The Grinch returned to animation in the 1977 special Halloween is Grinch Night, in which he sets off to scare everyone in Whoville due to being bothered by a chain reaction of annoying sounds caused by the wind. There, he was voiced by Hans Conried. Later, in 1982, he starred in The Grinch Grinches the Cat in the Hat, where he attempts to ruin things for fellow Seuss star The Cat in the Hat. Most recently, he was a recurring character on the 1996 kids' show The Wubbulous World of Dr. Seuss, where he was voiced by Anthony Asbury.

[via Wikipedia, emphasis mine]