It was October 2005 when "The Mad Scientist," Portis' first moniker, made his debut.
That week, Portis ran for three touchdowns, and the costumes were here to stay. Even when a losing streak jeopardized the Washington Redskins' chances at making the playoffs in 2005, Portis' teammates begged him to keep up the gag.
He did, and the Redskins made the playoffs. Here are five of his most memorable get-ups. Feel free to comment if I forget some of your favorites.