Rahzar is a giant wolf creature with blue veins.
When Ch'rell was rescued by the 1987 Shredder, a vast amount of the Cyber Foot Ninja's are turned into mutants for his disposal against the Turtles. Rahzar himself is among the first of the loyal Foot transformed into a hidious wolf like creature.
Rahzar and the rest of the mutated horde along with the new robotic Foot soldier's. Rahzar, Tokka and the other mutants were knocked out when the Turtles crashed their blimp on top of the horde.