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

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.