Newly graduated from exterminator college, Slip and the boys open a pest control business. Their first job leads to a doctor who wants to transplant Sach's brain.

The Bowery Boys -- Slip, Sach, Bobby, Whitey and Chuck -- start their own exterminating service and get a job, which takes them to a spooky old abandoned mansion in the middle of the night. Meeting up with pal Gabe and his new French bride, the boys are tormented by mad scientists who try to convince them the place is haunted and then kidnap Sach in order to place his brain inside a gorilla.—Marty McKee <[email protected]>

Slip, Bobby, Whitey and Chuck all graduate from Insect Exterminators College, but Dean Pettyboff flunks Sach. They set up business in Louie's Sweet Shop owned by Louie. Their friend Gabe returns from overseas with his French-bride Mignon and they follow the boys to the scene of their first exterminator job -- a supposedly haunted house. Mignon is kidnapped by Ivan, who, with Mrs. Grimm, also holds Dr. Bender prisoner in a secret room for mad Dr. Coslow. Coslow has his henchmen Ivan and Stiles grab Sach, with plans to transplant his brain into a gorilla.—Les Adams <[email protected]>