Patrons at Expo-21st Century are going wild over its biggest attraction, the Atlantean Pavilion, an authentic replica of the underwater city of Atlantis, populated by real Atlanteans. Chief among that population is Atlantis' royal family, who have consented to be the star performers in the exhibition tank. Aquaman demonstrates his telepathic command over sea life. Mera and Arthur, Jr. use their shared ability to control, and manipulate, water to construct a message for the audience. Aqualad and Aquagirl dance with Topo, an octopus, and Tusky, a walrus. After the show, the Atlantean royal family take in the other attractions at Expo-21st Century, just like any other tourists. Away from the Atlantean Pavilion, they are unaware of the threat that descends upon it. The Awesome Threesome have c