History:
Past:
Inspired by the Freedom Fighters, Sonar, Spike the Porcupine, and Trevor Burrow the Mole formed a team of Freedom Fighters at Shamar, creating a checkmate with Midesta Egg Army, so that they could not completely take over. The leader of the army, Nephthys the Vulture, is a close friend of the Desert Raiders and made sure to orchestrate their battles.

Shattered World Crisis Act 2:
Sonar and her team later rescued Sonic the Hedgehog, Antoine D'Coolette, Big the Cat, and Chip from an ambush from the Midesta Egg Army. After Sonar and her team drove off the Egg Soldiers, they were greeted by Sonic himself, startling the young aspiring heroes. Sonar's group then aided Sonic's team in rescuing Ehsan, with Sonar assisting Chip and Big in fighting the Dark Gaia Creatures. After Sonic's team left, though, Sonar and Spike contacted Nephthys to check up on her.

Soon, Sonar and Spike welcomed back Nephthys from facing the Naugus Twins at Eggman Land. While watching the Freedom Fighters broadcast, a tensed Sonar called Nepethys and told her of the situation, while the latter told her to calm down. Later on, Sonar and her team would rejoice as the world was restored by Chip.

Here's a pic of her for those who don't know: