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Reese recruits Zoe Morgan, Carter and Shaw to help him keep tabs on a chameleon playboy whose number has come up. Elsewhere, Root is hunted by a dangerous enemy and turns to the Machine for help escaping from her psych ward.
The team ventures into a vast cave system to prevent a bat population from destroying the North American ecosystem before Halloween. Then, the team helps stage pictures of Halloweens from Walter's past for his upcoming immigration inspection.
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Here's how everything changed in "Chapter 6"