One of my very earliest television memories is watching the First Doctor and Susan being chased down a foil-covered corridor by an irate dalek. It absolutely terrified me, especially seeing the dalek's shadow on the wall moments before it appeared. This image lingered for many years and when I came to watch The Five Doctors on DVD I felt a tinge of fearful nostalgia for that scene.

That is what this 20th Anniversary special is all about - nostalgia. Former doctors, former companions, classic monsters and villains (and a yeti) all provide 90 minutes of total self indulgence for the Doctor Who fan. Yes, Tom Baker got the hump about re-appearing only a couple of years after he had left but it didn't matter as we got to see some previously-untransmitted clips from the abandoned 1979 story 'Shada'. Yes, William Hartnell had died some years before but Richard Hurndall played a blinder as the First Doctor, adopting Hartnell's mannerisms but giving a performance that was more tribute than imitation, which worked brilliantly.

The storyline is a bit Terrance Dicks by-numbers, but there are so many treats here it's impossible not to get caught up in it all. Patrick Troughton and Jon Pertwee are clearly having a whale of a time, and I'm pleased to say that Peter Davison (current Doctor number 5) more than holds his own against them. We also have such visual gifts as the gimp-like Raston Warrior Robot, a vomiting Cyberman, Sarah Jane dramatically falling down a very gentle incline in the ground, and Susan making serious eye-contact with the Fifth Doctor (her GRANDFATHER, remember) and then falling over and spraining her ankle as per most of her '60s stories. Not to mention Liz Shaw's neon hair and Zoe wearing an outfit made of bubble-wrap.

This is a great romp that even the most hard-hearted fan will enjoy. Now out in a 2-disc special edition format featuring loads of extras, it's a worthy purchase and no mistake.