Bob Frank became an art teacher after his career as The Whizzer and one of students was drawing the Thing from Fantastic Four: The Animated Series (1994).
Earl Boen takes over the role of the Red Skull from David Warner who had previously voiced The Red Skull in Partners in Danger Chapter 2: The Cat (1997)
Kathy Garver, the voice of Firestar on Spider-Man and His Amazing Friends (1981), provides the voice of Madeline Joyce/Miss America in this multi-part "Six Forgotten Warriors" story arc. She also provided the voice for the lizard woman Gila in Season 4's Partners in Danger Chapter 10: Lizard King (1997).
Each of the five post-Captain America super soldier volunteers were affected differently with the re-created Super Solder formula: one's muscle strength was so increased he could run incredibly fast (The Whizzer), another gained the ability to control her mass which allowed her to will herself to become lighter than air (Miss America), another was able to create sonic shockwaves with his vocal cords (The Thunderer), the final two came closest to duplicating Captain America's powers (The Black Marvel and Destroyer).
Professor Omar Mosley tells the story of the Six American Warrior. It began in 1942 with the creation of Captain America, which was first seen in Partners in Danger Chapter 2: The Cat (1997). When German spies sabotaged the experiment, Dr. Reinstein was lost and so was the secret of Super Soldier formula which was in that lab. A team of scientists tried to recreate the formula to create an army of super soldiers, but due to war time rations were only to successfully complete it with 5 volunteers. However, the 5 new heroes powers weren't permanent and scientists deduced that those powers would cease altogether. So to ration their powers the scientists created ring devices to turn the heroes powers on and off. Only Captain America's powers were permanent since he took the original super soldier formula. The other 5 took names to suit their new identities: Destroyer, Miss America, The Thunderer, The Black Marvel and The Whizzer.