10 Dark Doctor Who Moments You Weren't Allowed To See

Returning enemies in the early years of NuWho included the Autons, the Daleks, the Cybermen, the Master, and the Macra.

Previously seen in the now-missing 1967 serial The Macra Terror, these creepy crustaceans weren’t exactly an obvious choice for a return. RTD only brought them back because he wanted Gridlock to feature crab-like creatures, and there just so happened to be a suitable candidate in the show’s back catalogue.

The combination of a limited CGI budget and Gridlock not needing to focus on the monster means that the Macra end up literally blending into the background. However, they were originally set to have a more prominent role.

RTD's early outline explored other parts of New New York besides the motorway, with fully-grown adult Macra lurking in the oceans. Also cut from the episode was the gruesome concept of insect-like 'baby' Macra, devouring drivers unfortunate enough to use the fast lane.

It’s one of those ideas that was simply too expensive to make a reality – which, for anyone who doesn’t like creepy-crawlies, was probably for the best.