Wombat Stu

Wombat Stu was the fourth member recruited to the Downunda Freedom Fighters, having joined the group after investigating the capture of numerous Mobians by the evil Crocbot. After helping the team destroy Crocbot's original base, Stu remained with the group through several engagements with Crocbot. Shortly after Miles "Tails" Prower arrived in Downunda, Stu was captured by Wing Dingoes while helping save the young Fox. The other Downunda Freedom Fighters came after him, only to be thwarted by Crocbot's CD-ROM Ram. Stu, meanwhile, had been beaten into unconsciousness by Crocbot, but revived just as Barby Koala and Tails came to his rescue. Following Crocbot's defeat, Stu joined Barby, Guru Emu, Duck "Bill" Platypus, and Walt Wallabee in bidding their new friend and ally farewell as he departed for Knothole.

Stu and the other Downunda Freedom Fighters were later captured by Crocbot, and due to the villain's separating them was thought dead along with Guru and Bill by Walt Wallabee. Crocbot revealed their continued existence while gloating over his capture of Bunnie Rabbot and Antoine D'Coolette, and the two Knothole Freedom Fighters soon joined their new allies in freeing Stu and the others. While their two newest friends escaped, Stu and the other Downunda Freedom Fighters revolted against Crocbot, overpowering his forces and seemingly winning the day.

However, only after a subsequent campaign in which the badly damaged Crocbot acted through a brainwashed Bill Platypus were Stu and the others able to finish their war with Crocbot with help from Tails and Sonic the Hedgehog. Embarrassingly for Stu, his greatest distinguishing moment in this conflict was being captured along with Guru Emu while heading to "negotiate" with Bill, thus necessitating a rescue by the other Freedom Fighters.

Following Crocbot's final defeat, the Downunda Freedom Fighters were left with little to do. Wombat Stu soon found relief from his boredom when Geoffrey St. John approached him with the offer of joining the Royal Secret Service. Stu quickly accepted, becoming the third member of the group after St. John and the Chameleon Valdez, and soon welcomed new teammates Hershey Cat, Heavy, and Bomb to the team. The high-tech arsenal of the Secret Service soon had Stu enamored of the organization, though his enthusiasm was soon dampened as he and his fellow recruits were put through harsh training to prepare them for any situation imaginable. Soon enough, the Wombat and his comrades found themselves put to the test, as they were dispatched to Angel Island to uncover the truth behind the fate of the long missing Queen Alicia Acorn.

Braving the bizarre weather conditions affecting the island at the time, they soon made contact with Kingdom of Acorn representative Colonel Sommersby, and shortly afterwards met Prince Elias Acorn, the heir to the throne who had also been missing and presumed dead. Following a harrowing experience surviving the island's hazards, they reached Haven, home base of the secretive Brotherhood of Guardians, where Alicia had been kept in stasis for many years. With queen and prince in tow, Stu and the rest of the Secret Service returned to Mobotropolis.

Stu continued to serve alongside the Royal Secret Service for some time, up until they were dispatched to the recaptured city of Robotropolis to retrieve the stolen Sword of Acorns from Dr. Eggman (none of them aware that Uma Arachnis had already stolen it from Eggman). Taken prisoner by Eggman, Stu was infected with nanobots along with the other agents and then allowed to escape. Later, it was revealed that Heavy and Bomb had been reprogrammed to assassinate the House of Acorn, and the activated nanobots rendered the rest of the Secret Service helpless to stop their former teammates. Luckily, Sonic was able to thwart the villainous scheme, and the Secret Service were purged of the nanobots. With the loss of Valdez, Heavy, and Bomb, however, the team was effectively disbanded, with Stu returning to Downunda while Geoffrey and Hershey remained in Knothole.

Once back in Downunda, Wombat rejoined his former Freedom Fighter group. He was with them when the hostile aliens known as the Xorda broadcasted their doomsday message to all of Mobius, telling the inhabitants of their impending demise. He and his teammates were then among the many Freedom Fighters who assembled on the Southern Tundra to try and destroy the Xorda's Quantum Dial weapon.