FLASHBACK: 'GUTS' Turns 25! What You Didn't Know About The Nickelodeon Classic

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Before 'American Ninja Warrior,' 90's kids dreamed of climbing the Aggro Crag. Before achieving boy band stardom, a Backstreet Boy was dunking on 12-foot high basketball hoops. ET is reliving the glory of 'GUTS,' which premiered on Sept. 19th, 1992.