Nailock makes his first appearance in episode four, when he battles an unwilling and lazy hacker named DemonKing. After that battle, Demonking quits the hackers and becomes friends with Nailock. In episode five, DemonKing alerts him of a plan that D-bug Org is going to kidnap Flamegirl to try to lure Alpha in to see the “Forbidden Power” for themselves. Nailock has many battles, the most intense in the season being against the Netking Zetto at the end of the Z-Tournament. The two seemed evenly matched for a while, except for Zetto's seemingly unbeatable final attack. During the battle Nailock found the only way to dodge Zetto's final attack was to jump last second, avoiding Zetto's cascade of explosions covering the entire grid. After dodging it, Nailock used his own special attack to win