We've not seen a story with this sense of scale since The Daemons, it did not surprise me when I found out that The Green Death was also penned by Robert Sloman who can now add a second excellent story to his name (lets not talk about The Time Monster).

Jo's ending is superbly handled, in an unprecedented and heartwarming exit. After years of unbelievable love stories - they finally achieved it here. As usual the relationship developed very quickly, but a lot more work was put into making it as believable as possible. She was ready to leave The Doctor before he even shoots off to Meteblis Three and was already gushing over Professor Cliff Jones before meeting him, but this relationship was marvelously built up over six episodes - he felt like a fitting substitute for The Doctor. It feels like another milestone for the show. Of course, the fact the actor was actually in a relationship with Katy Manning must have helped sell their onscreen romance.

The direction and editing was better than ever in this adventure - The Doctor and Jo say goodbye, he exits, she stays at the party. The two scenes are intercut with each other - Jo with her new fiance and friends, The Doctor - on his own, driving away. It was very sensitively handled, brave and emotional (though not over the top). Similar techniques are employed at the beginning of The Green Death when the gorgeous and mind bending Metebelis Three scenes are cut between the more ordinary but intriguing goings on Earth. The Metebelis Three scenes look like genuinely expensive film sequences, the giant bird, trademark Third Doctor tentacle and mysterious blue planet had a very memorable effect. It is rare to see this much pace and action in Doctor Who - but it was most welcome.

The maggots were an amazing concept for a menacing force - some of the ways of displaying giant maggots were more convincing than others, but it was a fantastic effort all round. The animatronic maggots on location in the slag heaps looked particularly good.

This was a story full to the brim with great characters. The return of UNIT was wonderful, it's brilliant to have that team back again. It was a superb story for Mike Yates who is interestingly given something quite different to do. UNIT are served better in this story through not having been in the show every week. The UNIT crew act as an interesting social middle ground between the lefties at the Nut Hutch and the seemingly malicious and cruel businessmen covering up malpractice at the plant. The writing that went into crafting these characters not only helped sell the social themes of the story - but could genuinely instill opinions in children that would last a lifetime.

I wasn't sure about Jo Grant when she first entered The Doctor's life. But her relationship with the Third Doctor has been absolutely marvelous. We've seen Jo grow as a character over three seasons and instill a sparky energy into the show. This was a fitting final episode for such an important character. I'm relieved that her era ended on a high. Jo Grant will be missed.