Season One
Production order shown in brackets after viewing order. Premiere UK air dates shown in brackets after title.
1.	(1.)	Instrument of Destruction (Part 1)	(12 February 2005)
2.	(2.)	Instrument of Destruction (Part 2)	(19 February 2005)
3.	(8.)	Swarm	(26 February 2005)
4.	(7.)	Rat Trap	(5 March 2005)
5.	(5.)	The Homecoming	(12 March 2005)
6.	(4.)	Mercury Falling	(19 March 2005)
7.	(9.)	Circles of Doom	(26 March 2005)
8.	(3.)	Rain of Terror	(9 April 2005)
9.	(12.)	Skin Deep	(16 April 2005)
10.	(6.)	Chiller	(23 April 2005)
11.	(10.)	Trap for a Rhino	(30 April 2005)
12.	(13.)	Heist	(7 May 2005)
13.	(11.)	The Achilles Messenger	(14 May 2005)
Season Two
1.	(11.)	Touch of the Reaper	(3 September 2005)
2.	(1.)	Virus	(10 September 2005)
3.	(3.)	Enigma	(17 September 2005)
4.	(4.)	Best of Enemies	(24 September 2005)
5.	(2.)	Contact	(1 October 2005)
6.	(5.)	Proteus	(8 October 2005)
7.	(6.)	Syrtis Major	(15 October 2005)
8.	(7.)	Fallen Angels	(22 October 2005)
9.	(8.)	The Storm at the End of the World	(29 October 2005)
10.	(9.)	Duel	(5 November 2005)
11.	(10.)	Shapeshifter	(12 November 2005)
12.	(12.)	Grey Skulls	(26 November 2005)
13.	(13.)	Dominion	(19 November 2005)