Continuity
- The Cybermen in this story post-date The Tenth Planet and The Invasion, as one of the Cybermen mentions the death of Mondas, the Doctor's defeat of the advance Earth invasion party and his encounter with them on Planet 14 (which was mentioned in The Invasion). At this point in their development the Cybermen have not yet colonised themselves on their new home world of Telos as demonstrated when they fail to recognise the reference via the Doctor. In Beyond the Vortex, Nicholas Briggs mentions that the Cybermen voices in the story were a mix of the ones used in the 2006 series and The Invasion.
- The Time Ring first featured in Genesis of the Daleks and also features in the next Eighth Doctor season finale, Sisters of the Flame/Vengeance of Morbius.
- The Headhunter first started chasing Lucie in Blood of the Daleks. She returns in the Series 2 story Grand Theft Cosmos, alongside Karen from this story.
- Straxus returns in Sisters of the Flame/Vengeance of Morbius.
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