在小镇附近的沼泽地里，一个伐木者看到巨型怪物，但没有人相信他们的话。后来， 戴夫·沃克认定是他红杏出墙的妻子与其情人卡尔·莫顿搞鬼，他追赶二人通过沼泽，并迫使他们跳入水中，水蛭蜂拥而上……
Ken Clark
Steve Benton
Yvette Vickers
Liz Walker
Jan Shepard
Nan Greyson
Michael Emmet
Cal Moulton
Tyler McVey
Doc Greyson
Bruno VeSota
Dave Walker
Gene Roth
Sheriff Kovis
Dan White
Porky Reed
George Cisar
Lem Sawyer
Guy Buccola
Giant Leech (uncredited)
Joseph Hamilton
Sam Peters (uncredited)
Walter Kelley
Mike (uncredited)
Bill Scully
Search Party Member (uncredited)
Carl Sklover
