hatch. Three guards soon overtake him, but Koenig incapacitates them with the extinguisher. As he activates the transmitter, Sares grabs him, boasting their shield is blocking his signal. Koenig escapes her and, with this new information, he changes tactics and heads back to the prison tower. Koenig enters the hall and, before anyone can prevent him, darts into the transbeam booth. Elizia raises a weapon, threatening to disintegrate him. Koenig cagily reminds everyone that if she shoots, she destroys the transbeamer—and their only means of returning home. The Interrogator reminds Elizia that, with no hope of parole, the prisoners will revolt. Crael addresses Koenig regarding his claim of a plague-ravaged Ellna. Koenig tells them Elizia has known about it all along and has been lying to them all. A verbal battle of wits ensues, with Koenig and Elizia each challenging the other's veracity. Upon engaging the transbeamer, Koenig issues her a final challenge to follow him herself and bring him back alive. On Ellna, Koenig activates the homing device, which is received by Eagle Two. On Entra, Elizia faces defeat. The Interrogator will no longer support her lies and the guards' loyalty is broken. She transports herself to Ellna, emboldened by the fact that she will at least kill Koenig before her own death, but she dies within moments of arriving. Eagle Two arrives and Koenig is rescued. Cast Starring Martin Landau — Commander John Koenig Barbara Bain — Doctor Helena Russell Also starring Catherine Schell — Maya Featuring Tony Anholt — Tony Verdeschi Guest stars Hildegarde Neil — Elizia Roy Marsden — Crael Also featuring Dora Reisser — The Interrogator Cassandra Harris — Controller Sares Angus MacInnes — Jelto Arthur White — Kinano Michael Dickinson — Blake Maine John Hug — Astronaut Bill Fraser Alibe Parsons — Alibe Sam Dastor — Doctor Ed Spencer Uncredited artists Geoffrey Greenhill — Phirly Peter Brayham — Garth Robert Reeves — Peter Del Baker — Hunted Prisoner Alan Harris — Accused Prisoner Music The score was re-edited from previous Space: 1999 incidental music tracks composed for the second series by Derek Wadsworth and draws primarily from the scores of "The Metamorph" and "The Exiles". Production notes With a plot derived from The Most Dangerous Game, set in an alien prison reminiscent of Devil's Island, and showcasing a bevy of catsuited, whip-wielding dominatrices, "Devil's Planet" is the last of the 'Koenig Double-Up' scripts. The