Some TMNT stuff really isn't for little kids.
We learn that the Triceraton warrior is named Zog, who has somehow managed to survive the destruction of the T.C.R.I. building in issue #7. Zog is not in good shape, however. The Earth's atmosphere is slowly eating away at his mind, driving him insane and making him sick. The alien's misfortune is good luck for the turtles, as Raphael has managed to convince Zog that they're on the same team. Zog thinks that Raph is his Triceraton Commander Zoraph and that the other turtles are aliens out to help the Triceraton Republic take control of the planet. Raphael convinces Zog that the Foot are their enemy, so the Triceraton is an eager and willing soldier against the Shredder and his Foot Clan.
Zog leads the turtles to a spot in the sewers and begins to stomp his huge foot on the ground. With little trouble, the gigantic warrior manages to smash a hole into the floor and he drops through into a control room being operated by the Foot. The turtles follow and quickly take charge of the room and the computers within. Donatello scans the Foot's database and discovers that the entire block is a front for Foot Headquarters. After briefly studying the schematics of the fortress, the protagonists hatch a plan of attack.
The turtles and Zog cut their way into the fortress, which is disguised as a huge bank. Don has arranged for the computers to set off false security alarms, to cover their tracks. As the team makes their way to where they believe the Shredder is hiding, they lose their bearings and make a wrong turn, entering a practice room full of Foot. A brief fight breaks out and Zog cuts down a large amount of Foot Ninja with his rifle.
Don apologizes for the wrong turn and the boys head into a loading dock. They find some more Foot working and another brief battle erupts. The team commandeer a truck from the dock and race further into the fortress. Almost immediately they're met by gun-toting Foot soldiers and a firefight breaks out. Donatello crashes the truck and the turtles and Zog leap out to engage the Foot in hand to hand combat. Zog is a killing machine, but he's wounded numerous times in the skirmish. Thanks to Zog's efforts, the turtles are win another quick victory. After the battle, the Triceraton stumbles down a hallway, rallying the turtles to follow him... unfortunately the giant alien has too much of a lead on the turtles and he enters a deadly room alone, where he is cut to pieces by a shadowy figure that appears to be the Shredder.
The turtles finally catch up to where Zog was heading, but they find their comrade dead on the floor, horribly mutilated. As the turtles mourn the loss of their unlikely ally, Michelangelo looks up and gasps, "Leo... choke... look!"
On the final double page spread we get our first look at Shredder's Elite Guard: three monstrously mutated ninja warriors decked out in Shredder's gear!
- Teenage Mutant Ninja Turtles: The Collected Book 4
- Teenage Mutant Ninja Turtles: The Ultimate Collection Volume 3
- This story is continued from TMNT (Vol. 1) #19. The story continues in TMNT (Vol. 1) #21.
- Zog was stranded on Earth in TMNT (Vol. 1) #7.