Aidan O'Callaghan

Aidan O'Callaghan (born 25 November 1988) is an Irish actor best known for roles in television and film, including The Witcher: Blood Origin, Wolfe, The Rook, EastEnders, Emmerdale and Coronation Street.

Career O'Callaghan portrayed Kareg in the Netflix series The Witcher: Blood Origin, a prequel to The Witcher series. Kareg is a member of the Dog Clan, an ancient warrior group sworn to protect the royal family of Xin'Trea. The cast included Lenny Henry, Mirren Mack, Michelle Yeoh and Laurence O'Fuarain.

He has appeared in Emmerdale, EastEnders and Coronation Street and has also worked on notable international projects like Wolfe and The Rook.

In 2024, O'Callaghan appeared in the short film A Simple Killing, which won the Judges’ Choice Award and Audience Award at the Waterford International Film Festival, and screened at the Newport Beach Film Festival, Raindance Film Festival, and the BAFTA- and Oscar-qualifying Foyle Film Festival.

In 2025, O'Callaghan played Col in the feature film The Reckoning of Erin Morrigan, Erin Morrigan's (Olwen Fouere) former lover and IRA operative. The film was nominated for Best Film and screened at the Chicago International Film Festival and Galway Film Fleadh.

Filmography

Television

The Witcher: Blood Origin - Role: Kareg Stoneheart (Netflix, fantasy/action) Wolfe - Role: Jake (crime/thriller) The Rook - Role: Alan (mystery/drama) Emmerdale - Role: Mike (ITV long-running UK soap opera) EastEnders - Role: Lewis Butler (BBC long-running UK soap opera) Coronation Street - Role: Alan Driscoll (ITV long-running UK soap opera)

Movies

The Reckoning of Erin Morrigan - Role: Col A Simple Killing - Role: Terry Somatic - Role: George Watson Clash of the Dead - Role: Elias