|“||Why are you hiding? You always used to talk so brave...come out and fight!||„|
|~ Radiak to Photok|
Radiak is one of the villains who appeared in the Bionicle series, serving as a minor antagonist in the 2008 storyline. He is an Av-Matoran who was, for a time, a Shadow Matoran.
Radiak was an Av-Matoran who lived in Karda Nui. He was once friends with his fellow Av-Matoran Photok and a hero among the Av-Matoran. However, he was ambushed by Vamprah and drained of his light energy. Afterwards, Radiak became a Shadow Matoran and Antroz' servant. Since Antroz (along with Vamprah and Chirox) had been blinded, Radiak, Gavla, and Kirop rode them and acted as their "eyes." Some time after that, Radiak was mutated into a four-legged form by Mutran.
Later, when Takanuva discovered that a Klakk could cure a Shadow Matoran and turn it back into an Av-Matoran, he used a Klakk's power on Radiak. An Av-Matoran once more, Radiak joined the evacuation of Karda Nui. He assembled with the Toa in Metru Nui to celebrate the awakening of Mata Nui.