Atlantis is under attack by the evil Ocean Master, and it is up to Aqualad, the Mermaid Nicoletta, and their superpets Fluffy the goldfish and Betty the beluga to defeat the supervillain.
When Swamp Thing is called away to help with a fire elsewhere, Solomon Grundy and his zombie pets decide to take over the swamp--and it is up to Ace the Bat-Hound and the Swamp-Pets to repel the invasion.