The plan was excuted, SS was attacking the Overlord with her laser, she also brainwashed the army to fight with her. Twilight was with the other mane 6 and explaining her plan to the others.
"When we say the word, we'll use the elements." said Twilight.
So the Mane 6 brought their weapons and shot the changlings who weren't influenced by SS. Then the Overlord slashed at SS before she shot the laser at the beast. Chrysilis deflected it, it wound up hitting the Overlord in the face.
"HEY!, WATCH WHERE YOU BLAST!" said the Overlord.
"IT WASN'T ME!" said Chrysilis. Chief noticed how the creature started to argue with Chrysalis.
"Twilight! When they argue with each other it distracts them! Use that against them!" said Chief.
"Got it! Hey Overlord." said Twilight.
"Why are you two merged anyway? You would be complete without her!" said Twilight.
"HEY, SHE'S RIGHT! I'D CRUSH THESE FOOLS IF YOU DIDN'T LEAP AT ME!" said the Overlord.
"IF YOU WERE SMART YOU'D WOULD OF KEPT IT AWAY FROM ME!" said Chrysalis.
The Overlord started to argue with Chrysalis, SS chose to blast again.
"HEY! SHOULD WE BE KILLING THEM?" asked Chrysalis.
"Uh, oh." said Twilight.
The Overlord took another blast to hit Chief.
"Chief!" said Twilight.
"Don't worry. My sheilds should be regenerating any second now." said Chief.
His armor was glowing as he was healing. So the plan was about to be finished as soon as the Overlord was weakened enough for the Elements. Twilight called for her friends but remembered that the beast was strong. So all she could do is wait until the Overlord was defeated by SS, who was failing. SS was about to fall, but Chief shot the beast with his assault rifle which did little damage.
SS blasted the Overlord when it was distracted by Chief.
"When's your plan ready?" asked Chief.
"Right as soon as I get this thing down.." said SS striking down the Overlord.
"Alright. Girls, let's move!" said Twilight.
The Mane 6 got there Elements and started to float. The Elements of Harmony were starting to blast.
"NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!" said the Overlord starting to shrink.
"No! Not again!" said Chrysilis.
"Surrender." said Chief aiming his gun at them if they escaped.
"Alright, we give up." said the Prophet. So when the heroes returned. Ponyville was back to the town it used to be, Twilight and Flash had their date, and the Spartans and the Covenant left Equestria.
"We'll be back Demons, we ALWAYS come back!" said the Prophet in a prison cell
"I feel ya." said Chrysilis.
A party was thrown for the Mane 6, Flash, even SS before she left to Earth and gained Twilight's trust. While the Spartans were celerbrating on Earth on the Infinity.