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On the Island
Rex in the Orchid Orientation film
Rex was last seen in the Orchid Orientation film, assisting Dr. Pierre Chang in the experiment with the rabbit. ("There's No Place Like Home, Part 3") However, it's unknown what happened to him afterward. He may have been killed along with other members of the DHARMA Initiative in the Purge, possibly defected to The Others prior to The Purge, or he may have left the island by some other means.