There are two options: Revert Game and Reset Adventure. I can never remember which one is which, but one sets you back to just before you left the last town. The other starts everything over, and that's the one you want. I believe it's Reset Adventure, but try them both to see what you get. If you don't get Gareth's opening monologue, you need the other one 
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*B*
Save Early, Save Often Save Before, Save After
Two-Star General, Spelling Soldiers
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Give 'em a hug one more time. It might be the last.
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