Mycroft Grimesby is the twin brother to Harcourt Grimesby, introduced in Season 1 of Murdoch Mysteries, portrayed by Gavin Crawford.

Appearances and Mentions

Belly Speaker

  • Mycroft and Harcourt are the twin sons of Roderick Grimesby. When they were born the family did not have the means to support two children. Roderick and his wife kept Harcourt and gave up Mycroft.
  • As an adult, Mycroft became a ventriloquist or "belly speaker" using his brother's name Harcourt and has a puppet named Mycroft.
  • He murdered his father and was briefly incarcerated at Station House Four. He was released when he told Detective William Murdoch that his twin brother, Mycroft, had murdered their father. By the time Murdoch uncovered the truth, Mycroft is untraceable.
  • The Grimesby men have the genetic trait known as heterochromia in which the eyes are different in colour. Where Roderick and Harcourt had brown right eyes and blue left eyes, Mycroft had the reverse. His puppet was painted similarly.




Murdoch Mysteries Season 1
"Power" • "The Glass Ceiling" • "The Knockdown" • "Elementary, My Dear Murdoch" • "'Til Death Do Us Part" • "Let Loose the Dogs" • "Body Double" • "Still Waters" • "Belly Speaker" • "Child's Play" • "Bad Medicine" • "The Prince and the Rebel" • "The Annoying Red Planet"
Season 2Season 3Season 4Season 5Season 6Season 7Season 8Season 9Season 10
Community content is available under CC-BY-SA unless otherwise noted.