Perhaps the first serial I've seen that would have benefited from one more episode rather than one less. I enjoy the first two episodes, but the ending comes so suddenly it's really unsatisfying. More time would have helped to: 1) flesh out the Chimerons' history and just what is up with that green baby; 2) lend more emotional impact to the tourists' and Murray's deaths; 3) develop Delta and Billy's relationship; and 4) give Ray's crush on Billy some more heft.

As it is, the whole thing is bright and invigorating. Some of the best costumes of the entire series, particularly for Mel and Delta. The comedic and musical performances, and the use of period music for the score, are also (pardon the pun) ace. And of course, Ray is a great character with a great actor. While I wouldn't wish her as a replacement for Ace, nor a co-companion (too similar), some missing adventures with the Doctor, Mel, and Ray as a Tardis team would be great...