Giz is a computer hacking expert who frequently carries a pet squirrel around. He usually works alongside his girlfriend Mouse. They briefly worked alongside Catwoman in stealing millions in cash but the group soon broke up. Giz and Mouse were later hired by Blockbuster to track Oracle's location through the computer systems. They succeeded but Black Canary managed to save Barbara from Blockbuster's thugs.
Giz and Mouse were then hired to blow up Dick Grayson's apartment building, which killed dozens of tenants. A deeply angered Nightwing let them go after they claimed they thought the building was supposed to be empty.