- Cary Bates
- Irv Novick
- Frank McLaughlin
- The Flash [Barry Allen]; Kid Flash [Wally West]; Paul Gambi; Mirror Master [Sam Scudder]; The Top; Pied Piper [Hartley Rathaway]; The Trickster [James Jesse]; Stacey Conwell; Iris Allen; Captain Cold (flashback); Captain Boomerang (flashback)
- The Mirror Master convinces Paul Gambi to make The Flash a new costume, but as soon as he starts wearing it, the Scarlet Speedster begins to act out of character.
This is the first time that the Mirror Master's christian name, Joe, is used in this series.
Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics.