He is designed to be a living laser bolt. Like an ordinary laser bolt, Zap can fly and bounce off surfaces.
In "627", 603 attacked a farm, but was defeated when Stitch trapped him in acontainment orb. However, Gantu and Experiment 627 then arrived and took 603 from Lilo and Stitch.
Zap reappeared in "Snafu", and was freed along with Gantu's other captive experiments by Lilo, Stitch, and several other experiments in a rescue mission.
all 624 experiments including zap were round up by Leroy and taken to a stadium to be destroyed. However, Lilo, Stitch, Jumba, Pleakley, Reuben and Gantu arrived before the experiments could be destroyed
It is unknown whether or not zap participated in the following battle between the experiments and the Leroy clones.
The Leroys soon gained the upper hand in the battle, but were defeated when Lilo, Stitch, Reuben and several other experiments performed the song Aloha Oe, which caused the Leroy army to shut down due to the original Leroy's failsafe.