The mechanical monster[1] is a boss in Secret Agent Clank. It is a fictional giant robot lizard[2] that Captain Qwark made up when writing his autobiography with Barney during "Qwarkography, Ch. 1". It greatly resembled the Terror of Talos from the Secret Agent Clank holo-vision series, with the battle against it also featuring giant ninjas.
The mechanical monster appeared as a giant robotic lizard. Qwark claimed the lizard was 50 ft high.[1] It had visible mechanical joints in its legs, elbows, and jaw, as well as a series of missile launchers on the back of its wings. With these it could launch swarms of missiles, but it was also capable of a shockwave attack by slamming its tail, and flight thanks to its enormous wings. With the use of power stations it also managed to generate an impenetrable forcefield. Its most powerful attack was a deathly laser beam.
Behind the scenes[]

Concept artwork of the mechanical monster
This entity is likely a reference to Mechagodzilla.