Tales of the Teen Titans — DC Comics
Issue: #84
Reprint of The New Teen Titans #24Mento uses Promethium to genetically create three new super villains to battle the Teen Titans: Pterodon, Gorgon and Harpi.
Creators: Marv Wolfman, Jon Peterson, Rick Bryant
Characters: Jason Todd, Cyborg, Beast Boy, Raven, Starfire, Donna Troy, Blackfire, Gorgon, Prometheus, Scirocco, Mento, Harpi, Touch 'n Go, Behemoth, Pterodon