Earth?

A story about kids on the ark comes to the earth after 97 years... but something went extremely wrong, but what?

People on the earth see a thing come out from the sky, but what?

"Who are you?" A guy in black clothes came and asked me.
"Clarke. Who are you?" I said while looking around to see where my brother is.
"Daryl Dixon." He says.
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What will happen?

Main characters:

Octavia Blake.
Lincoln.
Bellamy Blake.
Raven.
Clarke.
John Murphy.