At a nursing home, the elderly Warren Davidson watches a news report showing an old derelict spacecraft discovered by Thunderbird 6, when he hears a voice in his head and collapses. Gerald Simpson identifies the craft as one of the Guardian series of ships launched in 1995, each one controlled by a master computer. Records reveal that after the Guardian was launched from the space probe Dragonstar near Saturn years ago with Warren and Henry Davidson (both with telepathic implants connected to the Guardian) on board, Warren was lost in the planet's rings, with the Guardian's computer forcing the ship to look for him. The Dragonstar managed to rescue Warren, but Henry was trapped in space on board the Guardian in cryogenic suspension. As the Thunderbirds investigate the Guardian for retrieval, the ship perceives them as a threat and attacks them. Back at Arcology, it is discovered that the only crewmember still alive is Warren Davidson, but he has just had a heart attack. Using a duplicate Guardian, Dylan flies over to the other ship and rescue Henry while the ship continues to search for Warren and is on the lookout for any possible threat.moreless
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