Twin Peaks Nightmare.

Ninjago belongs to Lego.
Twin Peaks belong to David Lynch.
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Everyone he knew and loved were gone. Ridden with grief and anger, he couldn't move. However, he noticed footsteps coming towards him.
Turning around, he was greeted by a fist. Holding his nose, he felt cold fingers grab at his throat. He was paralyzed with fear.

"Who....are you?!"

His whole figure turned a 180 and he nearly screamed at who the killer was.....

It was himself, void of all emotions except a wicked grin.

"See, Kai, your stupid ego and recklessness led to the murders of your loved ones."

"No....."

"Yes..."

"It....it can't be true....."

"It is. Look on the bright side....At least, you'll be joining them very soon."

So saying, the doppelganger pushed Kai into a mirror.....hard.
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Kai awoke with tears in his eyes. It was not yet dawn............
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If you are asking, NO, Evil Kai or Shadow Kai did not kill Kai's family and friends. This is just Kai's deepest fear.