Who Is Number One?MysteryWho Is Number One?Mysterythumb_upthumb_downWho Is Number One?October 29, 1917Directed byWilliam BertramA silent 15-part movie serial.US content warning movie serial Last Updated: 11 days ago Request Update CastKathleen CliffordAimee VillonCullen LandisTommy HaleGordon SackvilleNeil HardinBruce SmithEthel RitchieCorinne Grant Image Gallery