The Time Monster is in the top quarter of Doctor Who stories and features the Doctor's great nemesis, the Master (Roger Delgado). The Time Monster is a 6 episode serial on 1 DVD with pretty good special features such as subtitled production notes, audio commentary, Professor Jim Al Khalil looking at the science behind the story, and a very informative 3-minute short on the restoration process. The restoration work here is generally great although some Atlantis scenes look like they are on an old VHS.
The Doctor (Jon Pertwee) is stuck on Earth and he and Jo (Katy Manning) are working with UNIT in England. A professor at a nearby institute is working on a machine that can displace objects using time. That professor is the Master and the Doctor arrives too late for him to bring a Mayan-looking Atlantean from Atlantis. With his help the master summons Kronos, a time-eating beast that looks like a guy wearing a big white bird outfit.
The Master soon learns his evil plan has a flaw and fixing this flaw involves going to Atlantis. Before he does this, he must stop the Doctor from following. This involves a few fun time intrusions features in episode 3.
Episode 4 of Doctor Who The Time Monster features a neat Tardis in a Tardis bit as the adventure moves on two time fronts; now and now. It ends with quite a cliffhanger or is it timehanger?
Episode 5 is quite busy story wise and include a visit to Atlantis and its scenery chewing king. It features an encounter with The Master and palatial shenanigans. Episode 6 brings a resolution to this very good story and includes quite a few cool plot twists.
This Doctor Who DVD features subtitled production notes, audio commentary, Professor Jim Al Khalil looking at the science behind the story, and a very informative 3-minute short on the restoration process.
Factoid. The interior of Doctor Who's Tardis in this episode was never used before or after.