Carol Hatcher was selected for the Project: Secret Weapons by Neville Alcott, and was given the Sonar suit . Due to neurological damage from the suit and the death of Richard Grant, Carol temporarily resigned as Sonar 
The sonar suit can direct sound at any given frequency to vibrate, move or destroy an object.
Secret Weapons (vol. 1) #11 (1994)
Country of origin:
- Secret Weapons (1993 series) #11
Valiant, August 1994
- Secret Weapons (1993 series) #14
Valiant, November 1994