This episode was announced as the first of a three-part story in
Totally Doctor Who, broadcast the day before. Prior to this, only the following two instalments had been linked. Later reference material, including
Doctor Who Magazine's season poll, treated the three episodes as a single three-part story. Russell T Davies has said that he regards "Utopia" as a separate story, but notes that the determination is arbitrary. This is the first episode in the revived series to credit three principal cast members within the
title sequence, with the addition of
John Barrowman, who plays Captain Jack Harkness.
Casting This is Derek Jacobi's third involvement in
Doctor Who. The first was in the September 2003 audio drama
Deadline, where he played a screenwriter who believes himself to be the Doctor. The second was several months later, in the webcast
Scream of the Shalka, where he played an
android version of the Master. In 2017, Jacobi reprised his role from "Utopia" in the audio drama series
The War Master. Other actors returning to the franchise in this episode are
Neil Reidman had previously played Tom Braudy in the
Eighth Doctor audio drama
Memory Lane and Robert Forknall, who plays
Lord Byron in the Eighth Doctor audio drama
The Company of Friends.
Chipo Chung, who played Chantho, would later go on to play the Fortuneteller in "
Turn Left".
Paul Marc Davis, who played the Futurekind chieftain, also returned to the
Doctor Who universe, going on to play the role of
The Trickster in
The Sarah Jane Adventures stories
Whatever Happened to Sarah Jane,
The Temptation of Sarah Jane Smith and
The Wedding of Sarah Jane Smith. He also had a small role in
Torchwood story
Exit Wounds and played the lead villain Corakinus in
Class.
John Bell was a nine-year-old who won a
Blue Peter competition to appear in this episode.
John Simm reprised his role as the Master in the
Tenth Doctor's final story
"The End of Time" and reprised the role again in
"World Enough and Time" and "
The Doctor Falls", the finale of
Series 10, the final series to feature
Peter Capaldi as the
Twelfth Doctor and
Michelle Gomez as
Missy. Simm reprised the role once again in the audio drama
Masterful by
Big Finish Productions.
Music Music originally composed for
Torchwood can be heard in the background of this episode: a variation of the
Torchwood theme plays when Jack runs towards the TARDIS and a
motif plays when Jack lies dead, having ridden on the TARDIS through the Vortex. The
drumming motif is suggestive of the fifth and subsequent bars of the
Doctor Who theme tune as composed by
Ron Grainer and realised by
Delia Derbyshire. ==Broadcast and reception==