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"One day on this planet is ten days on earth," said the ship's AI. "I was programmed to inform you this upon completion of your twelve-day mission on the planet's surface,"
No. Alex isn't the alien.
Even though it's been brought up a lot. Morgan had been an astronaut visiting an unknown planet.
That's why he's a D-Tier while the rest of his 'family' are not. Actually, his 'Family' isn't even his, his ship crash landed, and they found him nearby and adopted him.
So maybe he hasn't aged in the years he's been on this planet all that much.
So what if the reason Morgan asks to tag along with Alex is because he's still trying to get back to his real planet, and his home.
What of it?
If the planet he resides on ever learns he's the alien he won't survive and Alex will obliterate the world.