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We open on a vast desert. We fly over the baron wasteland and see a shadowy figure In the distance. We Inch closer. He's wearing boots, skinny jeans, a button down unbuttoned. It flows In the wind. He's been traveling for some time, you can see, the story told though the lines on his grizzled, unshaven face. He turns. He looks at the camera. "Hello again, old friend," he says. "So. You've finally made It back to the beginning, have you?" 

TLDR; Chris Is the host now and this Is the first episode of season four.