Tahnok-Kal

"Stand aside, Toa Nuva. You are in my way."

- Tahnok-Kal to the Toa Nuva "You are too late! Already, we have learned where the Bahrag are hidden! We will free Cahdok and Gahdok -- and the swarms will be free again!"

- Tahnok-Kal to Tahu and Pohatu

Tahnok-Kal is one of the main antagonists in the first-half 2003 story in the BIONICLE series. It was a mutated Tahnok who served as the leader of the group of the mutated Bohrok called the Bohrok-Kal, whose goal is to free the Bahrag, the queens of the Bohrok swarm and to reawaken the swarm once again to be unleashed on the island of Mata Nui.

It was voiced by Michael Strickland, who also voiced as Umarak in the animated series.

Appearance
Although its appearance resembles the normal Tahnok, though the difference is that it have silver head with the his symbol engraved on its face. It also have two pairs of blue eyes and red body with the silver feet. It also carried two pairs of silver Shields of Electricity as well as the silver Krana-Kal Xa.

Early Life
Tahnok-Kal was once an Av-Matoran, who was destined to transform into the Tahnok. Eventually, it was exposed to a mutagenic substance by the Bahrag, thus transforming into into the Bohrok-Kal.

Later along with the other Bohrok-Kal as well as the entire swarm, they then went into hibernation in their nest, awaiting their time of cleansing the island of Mata Nui in the preparation of the Great Spirit's reawakening.

Freeing the Bahrag
Following the Bahrag's defeats in the hands of the Toa Mata, the small group of Bohrok Va went into the deeper level of the nest, where they eventually awaken Tahnok-Kal and the other Bohrok-Kal. Soon after that, the Bohrok-Kal then learnt of the situation and decide to free the queens in order to reawaken the swarm once again.

After organizing a plan to rob the Nuva Symbol, the Bohrok-Kal attacked Ta-Koro and during the fight, Tahnok-Kal quickly imprisoned Jaller in a electrical cage and stole Tahu's Nuva Symbol. After that, it defeated Tahu by bringing the stone archway down on him.

Later, Tahnok-Kal's Krana-Kal Xa revealed the location of the Bahrag and the Bohrok-Kal quickly discovered that the location was guarded by the Exo-Toa. When the Bohrok-Kal got to their destination, they attacked the Exo-Toa and destroyed them. Then,

Personality
As the leader of the Bohrok-Kal, Tahnok-Kal was completely cruel, short-tempered and arrogant. Along with the others, it have one goal in its mind; was to free the Bahrag and reawaken the Bohrok once more in order to carry out their goal. Its short-tempered personality also reflexed its lightning like speed as it sees those who see it in action.