At university, Callaghan was a member of the
Cambridge Footlights. He made his television debut as
Henry Stafford in the historical drama
The Spanish Princess in 2020. Callaghan also had early roles in the long-running British television series
Casualty and
Doctor Who, in which he appeared as Allan K. Sullivan in the episode
Dot and Bubble in series 14. He had the role of Wayne in the 2024 horror film
The Strangers – Chapter 2. He has the lead role as Rudy Baylor in the upcoming 2025 television drama series
The Rainmaker based on
John Grisham's
1995 novel of the same name. The role previously was played by
Matt Damon in the 1997 film adaptation. ==Filmography==