Smallville 10x21 Finale Season 10 Season 0 0 EpisodesSeason 1 21 EpisodesSeason 2 23 EpisodesSeason 3 22 EpisodesSeason 4 22 EpisodesSeason 5 22 EpisodesSeason 6 22 EpisodesSeason 7 20 EpisodesSeason 8 22 EpisodesSeason 9 21 EpisodesSeason 10 21 Episodes 10x1 - Lazarus 10x2 - Shield 10x3 - Supergirl 10x4 - Homecoming 10x5 - Isis 10x6 - Harvest 10x7 - Ambush 10x8 - Abandoned 10x9 - Patriot 10x10 - Luthor 10x11 - Icarus 10x12 - Collateral 10x13 - Beacon 10x14 - Masquerade 10x15 - Fortune 10x16 - Scion 10x17 - Kent 10x18 - Booster 10x19 - Dominion 10x20 - Prophecy 10x21 - Finale The story of Clark Kent culminates in this epic two-hour series finale as Clark takes the last step to becoming the Man of Steel.