Complex sentence: Johnny Quest is now "Action Johnny", Hadji is now "Radji", Race Bannon is referred to as "Red", and Doctor Zin is "Doctor Z", an elderly and respected supervillain within the show's universe.
Split into simpler sentences: Johnny Quest is now "Action Johnny", Hadji is now "Radji", Doctor Zin is "Doctor Z", and Race Bannon is referred to as "Red". Dr. Zin appears as "Dr. Z", an elderly and respected supervillain within the show's universe.