Rob Knox played Marcus Belby in Harry Potter and the Half-Blood Prince.

Quick Scoop: Who Did Rob Knox Play?

  • Rob Knox appeared as Marcus Belby , a Ravenclaw student at Hogwarts.
  • The character shows up in Harry Potter and the Half-Blood Prince , mainly in scenes connected to Professor Slughorn’s Slug Club.
  • In the story, Marcus is invited to the Slug Club because his uncle, Damocles Belby , invented the Wolfsbane Potion, even though Marcus himself has little relationship with him.

A Bit More Context

  • Rob Knox’s role as Marcus Belby was intended to continue: he had reportedly signed on to return as Marcus in Harry Potter and the Deathly Hallows – Part 1.
  • Tragically, he was killed in 2008 shortly after filming his scenes for Half-Blood Prince , making his appearance in the film posthumous.

TL;DR: Rob Knox played Marcus Belby , a Ravenclaw student and Slug Club member, in Harry Potter and the Half-Blood Prince.

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