Avon, Vila, Gan and Jenna are suffering from radiation sickness contracted by their prolonged stay on Cephlon.
Blake and his group decide that whatever Orac is, it could swing the balance of power against them, and decide they must stop the Federation from getting to it firstc. They seek out the reclusive computer genius Ensor who has created Orac, with the Federation's Servalan and Travis close on their tails.
But all is not well on the Liberator. Avon, Jenna, Vila and Gan are suffering from radiation sickness, caused by spending too much time on the planet Cephlon. However the Liberator is out of the required drugs. They are hoping they can get new drugs from Ensor.
Blake and Cally manage to get to Ensor's underwater base and discover that Orac is an incredible computer brain, able to access information from any computer in Federation space. Ensor gives them the required radiation drugs and agrees to go with them to the Liberator, in the hope they can replace the aging power cells in his cardiac system.
However, on their way out to the surface, the encouter Servalan and Travis, and a daring chase takes place through the underwater tunnels. During the chase, Ensor dies, but Blake and Jenna finally make it to the surface, only to be surprised by Servalan and Travis who have used a different route.
Just before Travis fires on Blake, Avon appears with Vila, worried about the length of time the operation is taking and he destroy's Travis' gun. Leaving them on the planet, Blake and his crew teleport back to the Liberator.
The episode ends with the crew testing Orac, who reveals that by using the known knowledge of all the computers he has access to, and by using logical extrapolation, he can predict the future. The episode - and this series - ends with his prediction.... the Liberator being destroyed!
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