Junior Gorg is the son of Pa Gorg and Ma Gorg, the self-proclaimed queen and king of the Universe. As prince, he is given orders for a number of chores around the castle, including the maintenance of the royal radish garden. He sets traps in the garden outside the castle, for the purpose of capturing the Fraggles who sneak onto the Gorg's property to harvest radishes. His favorite dish is watermelon en croute.

Junior is proud of his Gorg heritage. He is always eager to please his parents, even when he doesn't understand the orders they give him. Junior says that he is "only 473." Since the episode aired in 1984, assuming a literal time-frame, this would place his birth date in the year 1511. Junior's best friend is an enormous radish that he calls Geraldine. This was apparently his only friend until he made friends with Gobo.

Season's 4 and 5 saw a turnaround for the relationship between the Fraggle and the Gorgs. Junior tries to prevent himself from becoming king by eating the last leaf on the Nirvana Tree which ends up shrinking him to Fraggle size (an example of Walk-Around and Puppet Switching). During that time with the help of Wembley Fraggle, he ended up learning of the Fraggle and Doozer cultures, even preventing his parents from using a bomb to destroy Fraggle Rock. Upon returning to normal size, he becomes King and ends up disbanding the hierarchy as he throws his crown very far where it lands in a forest in Outer Space where Doc and Sprocket where camping. He can be seen talking with Gobo about the Honk of Honks where he lends a noisemaker to help Gobo in his quest.