Warriors of the Deep successfully goes full on action adventure across its first two parts. Guns! Violence! Underwater sequences! It’s best attributes come from these sparky James Bond-esque encounters that we’ve not seen from the show since the Third Doctor’s time - and these sequences feel significantly more modern.

There are a lot of focal points. Three malicious forces including nefarious, scheming crewmates who want to sabotage this secret underwater mission. Despite some unconvincing guest actors taking up the parts of these spies, their scheme still flows nicely. The story is significantly more hampered by the poorly realised Silurian and Sea Devil costumes which look hopelessly out of date for the 1980s. You have to feel sorry for the actors trying to get a story across in a costume when they can’t move their mouth. Any alien that has lips should be able to move them - they should not instead have lamps on their head that light up when they're talking. They look like they have a permanent, cute little smile on their face which diminishes any drama they try and create.

This is all before you get to the lumbering Myrka which looks frankly like a huge and ridiculous party costume. At the beginning of part three it very slowly makes its way towards The Doctor whilst he tries to free Tegan from underneath the world’s heaviest Styrofoam door. Later we see the Silurian’s “manipulator” stuffed full of cotton wool and colourful plastic straws. If only they’d had a budget to realise some of this stuff!!

It’s a real shame when the key thing holding a story back is it’s production values, something Doctor Who was historically able to handle quite well. Warriors of the Deep, if you strip away all of the visual failure is a very interesting story with a neat, if over ambitious script.