the all time classic monster episode with the added appeal that, for once, Koenig has to play second fiddle to another member of the cast
(Anthony McKay, DWB, 1992)
features an honest to goodness tentacled monster which sucks up its victims with the force of a tv-advertised vacuum cleaner, and then spits out the crunchy bits
(David Scott, DWB, 1992)
The very best, the episode everyone remembers. Perhaps it's the well executed 'dragon' that sticks in the mind, or the superb effects accompanied by the classical music of Albinoni or the fascinating flashbacks to the earlier careers of the main characters that make this episode a winner. Whatever, this is perhaps the only occasion the series got absolutely everything right, and it's one to savour.
(Richard Houldsworth, TV Zone, 1992)
Year One's only monster story and very chilling it is too. The 'Dragon' is superbly nightmarish, the flashback sequences are extremely effective and the whole adds up to the series' most memorable episode. A+
(Chris Bentley, SFX 20, 1996)
One of the best and most frightening instalments of the series. This one is a nail biter.
(John Kenneth Muir, Exploring Space: 1999, p78-79)
My favourite episode, with solid storyline and some nice, scary moments. ***- (very good)
(James O'Neill, Sci-Fi On Tape, p271, 1997)
The superior quality of Dragon's Domain and the thoroughly outstanding production values create a truly great Space 1999 episode. 10/10
(Bob Wood, The Future Is Fantastic, 2001)
A great character study and unusual structure make this a real standout. 4/5
(Alasdair Stuart, SciFiNow #10, 2007)