Arnold's Hero (a.k.a.) The Hero Diff'rent Strokes : Season 2 Episode 7

Arnold's wildest dream is realized when he comes face-to-knee with "The Champ" -- special guest star Muhammad Ali. When the meeting arranged by Mr. Drummond between Arnold and his idol, Muhammad Ali, falls through, Kimberly and Willis concoct a wild scheme to insure that Arnold's dream will come true.