This may well be the weakest storyline BBC handed poor Patrick Troughton, the very finest actor ever to portray the good Doctor, but, notwithstanding the loss of three of its four episodes on film, Troughton's skill and uniquely irresistable charm manages to save the day, just as the Doctor, Jamie, and the wonderful Polly manage to save the world, once again. The mad scientist with the German accent may go a bit over the top (or so Troughton and his sidekicks felt, as we are told in the excellent behind-the-scenes narration by Polly), and the Atlantean "fish people" may dangle a bit too crudely from their obvious cables (shown all-too-clearly in the restored surviving episode, available in the indispensible DVD set, "Lost in Time"), but this is really must-listen Doctor Who. Frazer Hines gives his usual excellent performance as Jamie, and the teaming of the Doctor, Jamie, and Polly, which shines so well in this adventure, really was one of the strongest in the series. (Polly's early departure from the show is something of a tragedy, as is the near-total loss of her fine work on film.) The plot, in a nutshell: mad scientist who has found Atlantis and set up shop there (converting some of the populace to "fish people" through gill-insertion operations - from which Polly is narrowly rescued) decides to create a fissure in the earth's crust, destroying the world in a gigantic magma flow, just to prove he could do it. Doctor blunders onto scene and stops him, in the nick of time, and mad scientist drowns rather than let go his grip on the detonator (rather spectacular, that). Actually, it's much better than it sounds, and with Troughton's rich voice (Polly calls it "chocolate" at one point, aptly), superb acting skills, and irresistable charm as the Doctor, it's well worth adding to your collection. This may be the solitary case in which the loss of the filmed version might actually boost the quality of the production, given BBC's cheesy special effects and criminally "thrifty" budgeting. Apparently, the regulars realized this would be something of a white elephant, but actually it comes out quite well, large thanks to the great Patrick Troughton. Glad I bought it!