I bought the DVD for the Tom Baker story Underworld and watched it this last weekend. The show was a decent idea, but it came close to the end of the season where they were really under budget constraints as inflation hit after the season budget had already been worked up. Over half of it was done using Chromakey blue screen. The DVD is still worth it for me, though, due to all the extra stuff on it. They've got old footage of set rehearsals and such. Hearing Tom making quips and goofing off is well worth the $20 I spent. My new favorite quote is "I'm from fucking Gallifrey!" The commentary also has Baker as well as Louise Jameson and one of the story's writers. It's fun hearing them just tell old stories about being on the set or how shit just worked out back then.