The Fight For Denta.
The Irken Rebellion and Nightmare Tak's Dalek crew had gone to Planet Denta to look for the three gems that Frenge had. Zim and the others went there to stop them. After a HUGE battle against the Masked Man's forces, Zim, Dib, and Grim had gotten to where the deactivated Nightmare Dimension portal was. They used the gems to activate it. When they entered it, they encountered Nightmare Zim, Nightmare Grim, and Nightmare Dakama. After defeating them, they found out that it was a fake Nightmare Zim. They where cornered by Nightmare Tak who revealed that Nightmare Zim died as a result of Zim being so much different from him. They managed to escape and won the battle for Planet Denta.