After a 4-hour ride to Earth, Skarr turned on a cloaking device, disguising the Voot Cruiser as a Helicopter. She flicked a few switches, and found where Zim should be, or, more accurately, where his base is. Skarr found an empty spot between two houses, only 2 houses away from Zim's base. She quickly landed the Cruiser, and disguised it this time as an RV.
Skarr knew she had to think of a new name and a good human disguise. After an hour or so, she stepped out of the cruiser, Mik disguised as a Dalmatian, now known as Spot. Skarr followed, now wearing Gothic chain-pants and a plain black T-shirt, along with a long black-haired wig with purple streaks and blue contact lenses.
"Mik--I mean...Spot. Call me Tess. While we're on Earth, you're new name is Spot, my new name is Tess. Got that?"
"Temporary reprogramming taking place. New SIR name: Spot. New Master Name: Tess. Systems fully functional. Temporary Reprogramming Complete. "
'Tess' then began working out a plan, and continued doing so until around 8 AM. She then woke 'Spot' from sleep mode, and exited the Cruiser. Tess and Spot marched over to Zim's house, knocked on his door, dropped a note on his doorstep, and ran (both from the laser-shooting gnomes, and from Zim) back to the Cruiser.
GIR came to the door, grabbed the letter, went back inside the house, and brought it back to Zim.
"Who would write to Zim? Not even the Dib-stink would dare to send me a letter! GIR, do you know?" screamed Zim.
"I made more waffles!" screamed GIR, squirting syrup on Zim's boots.
Zim ignored Gir and began to read the letter, written entirely in Irken.
"Dear Zim, You don't know me, and I don't know you personally, but I sure know who you are. You are the one that caused Horrible Painful Overload Day, correct? You are the one that gave me these deformities, shoving me aside, with no chance at ever being honored because of my great height? Meet me on the closest side of Earth's moon tonight. Leave Earth's atmosphere around 9PM. Wear no disguise. Make sure to bring your SIR. –Skarr"
Later that night, at exactly 9PM, both Skarr and Zim left Earth's atmosphere, headed for the Moon. When they arrived, Skarr got out of her Cruiser, Mik following right behind her. Zim got out of his Cruiser, dragging GIR behind him. Zim was wearing his usual Invader uniform, GIR in his natural robot form. Skarr was wearing an indigo battle outfit, with massive blasters attached to either shoulder.
As Zim and Skarr began to battle, both GIR and Mik began to fight as well. Mik ripped GIR's head open, and began to rip out the wiring. GIR squirted Syrup at Mik, temporary blinding him. A small bit of the syrup also ricocheted back towards GIR, getting in his head, ruining the wires, and permantely disabling GIR. Mik then went to help Skarr battle Zim.
Skarr extended her Spider Legs, as did Zim. Skarr's blasters were powering up, as Zim took a swing with his spider legs, knocking off one of Skarr's. Skarr then stepped back several feet, bent down, and shot an enormous blast from the lasers, knocking off all of Zim's spider legs but one. Seeing no more use for them, Zim retracted his last spider leg, and ran up to Skarr, jumped on her back, and dislodged her PAK. Skarr fell to the ground, unable to move.
Zim tried to dislodge his own PAK to put on Skarr's so he could use the spider legs to crush her, but Mik ran over to Zim and grabbed the PAK, and they chased each other. Mik made it over to Skarr, and was about to re-attach her PAK, but Zim was just fast enough, so he and Mik were wrestling for the PAK. Mik finally shot a laser from his eyes at Zim's hands, making Zim flinch, giving Mik Skarr's PAK, and just enough time to reattach it to Skarr.
Mik quickly hovered the PAK over Skarr's back, and the PAK attached itself to Skarr. Skarr immediately regained consciousness, sprang back up on her Spider Legs, powered up her blasters again, and shot them directly at Zim's PAK, as Zim was fleeing. Skarr's blast knocked Zim's PAK off his back, and with nobody else to help Zim, he was sure to die.
Skarr then ran back into the Voot Cruiser, with Mik getting into Zim's Voot Runner. Skarr took off towards Saturn again, revenge gained, with Mik following in the Voot Runner.
"Ha! I get revenge, and a new vehicle to help me conquer Saturn! This will be easy!" laughed Skarr, flying back to Saturn, Mik still following.
Back on the Moon, the force of both the Runner and Cruiser taking off at once caused Zim's body to flop onto it's back, originally being on its side, and he was then close enough for his PAK to reattach. Zim then sat up, and noticed he was alone. Nobody else. No Irkens, No GIR, not even Skarr, no way back to Earth or Irk, and nobody caring enough to come and find him.