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  • Torchwood - Weevils - 7 appearances, although most are cameos. 8 appearances if you count the photograph of one briefly glimpsed in Torchwood: Miracle Day part one: "The New World"
  • SJA - Raxacoricofallapatorians - tied with the Trickster with 3 appearances unless you count the Slitheen cameo in "The Nightmare Man", in which the Raxacoricofallapatorians are the sole winners with 4 appearances
  • K9 and Company - Only had one story, so the Hecate Cult are the only enemies to appear
  • K9 - The Korven - 6 appearances
  • Class - The Shadowkin - 3 appearances, unless you count Miss Quill, who appeared in all 8 episodes of the series