The two main characters would have been Sabre (replaced by Fox McCloud), who was the son of a wizard named Randorn, and Krystal, who was Randorn's adopted daughter (and thus Sabre's adopted sister). They would have been accompanied by their respective sidekicks, Tricky (for Sabre) and Kyte (for Krystal).
What little is known about the game is that development was in progress sometime around 1999 and 2000. Originally, the game had nothing to do with the Star Fox series and was intended to be a stand-alone title.
According to an interview with Shigeru Miyamoto, he had noticed the striking similarities between the game's characters and those of Star Fox and so the decision was made for the game to become part of Star Fox series. Rare had previously released many pieces of artwork, screenshots, trailers and even soundtrack material before this decision was made and many of these can still be found today.
- Sabre is seen with a Sword in various prototype artworks and screenshots, instead of Krystal's Staff, meaning Krystal would have kept the Staff as her own weapon during gameplay. This changed when Dinosaur Planet merged with the Star Fox series, leaving General Scales as the only character with a Sword.
- It is said that Sabre was the son of a wizard named Randorn and Krystal was his adopted sister. Ironically, Randorn is a slight anagram of Andross, who is gifted in magic (or rather, psychic abilities) and is widely believed to be responsible for the deaths of both Fox and Krystal's parents.
- In the N64 development of Dinosaur Planet, both Sabre and Krystal ran on the same model engine, possibly due to similar lines and animations both characters would say and do in-game. This is evident when Sabre makes commands and grunts in Krystal's voice as well as his HUD having a picture of Krystal, instead of himself. Lines that Sabre would only say were kept in his voice
- Sabre's name may have come from Sabre Wulf, the titular character of a game Rare made back when they were Ultimate Play the Game.