Raelee Hill & Melissa Jaffer
If I remember correctly, Ms. Hill was in every single episode of the fourth season, and Ms. Jaffer's presence became larger as the season went along. So how come they were only credited as guest stars instead of being included as part of the main cast? Gigi Edgley has a smaller presence when she joined the show in the first season, and she still ended up listed in the intro by the time it drew to a close.
A Superman without trunks isn't worth watching or reading about.