The Auctioneers. A secret global network, collecting and exploiting alien technology for maximum profit. After they threaten UNIT, the consequences are grave. Kate Stewart has vowed to take them down. But another menace is close. The Cybermen are coming, and UNIT’s only hope could be its greatest enemy. The Master. 6.1 Game Theory by Matt Fitton Sam Bishop is missing. Lost at sea, imprisoned with a valuable hostage, UNIT’s troubleshooter will need all his skills to survive. To save their comrade, Kate Stewart and Osgood are offered a deadly challenge. But this game might be impossible to win… 6.2 Telepresence by Guy Adams Testing salvaged equipment, Osgood leads Colonel Shindi and Josh Carter on a strange expedition into uncharted territory. A virtual world. When the team is attacked, Kate tries to assist. But it seems the technology itself is doing all it can to keep her apart from her people. 6.3 Code Silver by Guy Adams The Cybermen are coming. Across the barriers between universes, conquering all before them. Conquering and converting. As her troops fight a relentless enemy, Kate battles to lock down the threat. But how long can UNIT resist? 6.4 Master of Worlds by Matt Fitton The Cybermen are close to victory. A world under Cybercontrol. A new paradigm to expand the Cyber-race. Fresh from the Time War, the Master arrives at the hour of Earth's greatest need. But he really doesn't care... Written By: Matt Fitton, Guy Adams Directed By: Ken Bentley Cast Jemma Redgrave (Kate Stewart), Ingrid Oliver (Osgood), James Joyce (Captain Josh Carter), Ramon Tikaram (Colonel Shindi), Warren Brown (Sam Bishop), Kerry Fox (Julia Hartley-Price), Louis Tamone (Lt Commander Parsons), Derek Jacobi (The War Master) and Nicholas Briggs (The Cybermen). Other parts played by members of the cast.