This number appears frequently in the series; in this episode, Red Tornado is identified as League member 16, and Superboy is revealed to be 16 weeks old.

Robin (Dick Grayson), Aqualad (Kaldur'ahm), Kid Flash (Wally West), and Speedy (Roy Harper).

Inside, they discover a massive underground facility creating "Genomorphs"—genetically engineered living weapons. On sub-level 52, they find Project Kr , a teenage clone of Superman known as Superboy.

After the Justice League is called away to deal with a global threat from the sorcerer Wotan , the remaining trio—Robin, Aqualad, and Kid Flash—decide to investigate a fire at Project Cadmus .

The episode won an Emmy for Individual Achievement in Animation, specifically for character designer Phil Bourassa.