Captain America Comics #25

In the first part of this two part story, Cap and Bucky defeat a giant cockroach which had been set upon them by Togaro, a tyrant from a microworld. Cap and Bucky use shrinking drugs to enter the microworld and search out Togaro. The story ends when some of Togaro's men on Earth spill a drop of acid on the stone which contains the microworld and the deadly flood threatens to destroy Cap and Bucky.