Viper

Viper is the main antagonist of the series. He is an enemy to the Agency and Team Spy Gear. Viper has access to real-time satellite imagery of Stoneship Woods.

Before the Series
Viper created a scheme to bring down all thirteen servers of the Internet and recruited many skilled hackers like Marco and his friends.

Book 1: The Secret of Stoneship Woods
Team Spy Gear stops the scheme by thwarting Marco, as all servers must go down to crash the entire Internet. After Marco's failure, the Agency takes care of the rest.

Book 2: The Massively Multiplayer Mystery
Viper created a new scheme, this time, creating a studio composed of expert game designers. They created a game to induce fear to all Carrolton kids who play it. Viper plans to control the world through fear, starting with the game. Team Spy Gear stops the scheme by figuring out the location of Viper's game studio.

Book 3: The Quantum Quandary
After the failed scheme, Viper then planned to take over all technology using quantum computing, with the help of scientists like Dr. Hork. They created a tree-house laboratory in the Old North Stand to start building a quantum computer. However, Team Spy Gear discovered the lab, forcing the Viper's minions to flee in Viper's spaceship. When the team found the place deserted, they accidentally activate the lab's self-destruct feature.