At first Michael acts like he doesn't know what Jack is talking about, but eventually he tells the truth. The Others gave him a list of names: Jack, James (Sawyer), Hugo (Hurley), and Kate. He was to bring only those four and the Others would give Michael his son Walt back.
Jack Forces Michael to Tell the Truth
By Bonnie Covel, About.com Guide
Michael (Harold Perrineau) and Jack (Matthew Fox)
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