Jeremy Kemp turns in a magnificent performance as the guilt ridden Queller. This story is an example of how the human side of the Space 1999 equation can work without being sentimental. If one ignores the coincidence that Queller just happened to be aboard Alpha, this story cannot be faulted. Rating 9/10
(Anthony McKay, DWB, 1992)
Basically it's a character piece; Queller has to come to terms with his remorse, his assistant Jim Haines has to come to terms with his hatred and the aliens have come for revenge. Some strong acting complements the strong storyline.
(Richard Houldsworth, TV Zone, 1992)
An above average Year One episode with an interesting take on the theme of rogue technology and its consequences. Kemp is excellent as the tortured scientist who created a nightmare. B+
(Chris Bentley, SFX 20, 1996)
Another high quality story that examines mankind's place in the Universe.
(John Kenneth Muir, Exploring Space: 1999, p53)
** (fair)
(James O'Neill, Sci-Fi On Tape, p272, 1997)
[Queller] is portrayed perfectly by Jeremy Kemp - alternately powerful, touching, heroic, or simply a tired old scientist who has been worn down by years of accumulated guilt. 8.5/10
(Bob Wood, The Future Is Fantastic, 2001)
A neat premise, plenty of action and a solid human element make this a fantastic episode. 4/5
(Alasdair Stuart, SciFiNow #10, 2007)