Sam Bishop Sam Bishop was a member of UNIT . Biography . Early life . Though he came from a family of bookkeepers and teachers , Sam was inspired to join the British Army as a child by his great - grandfather , who would regale him with stories of when he fought with the Eighth Army in North Africa during World War II , serving in battlefronts such as El Alamein , Tobruk , and Gazala . ( AUDIO : " Earthfall " ) Stopping a Nestene invasion . With UNIT , Bishop often went on dangerous missions . Kate Stewart sent him on a mission to the Gobi Desert to track a Nestene energy unit s . On this mission , a group of Auton s attacked him . He was then sent to Puerto Rico to track the energy units landing . ( AUDIO : " Earthfall " ) He sent Kate and Colonel Shindi to Black Archive 5 , as there was something useful in the vault . ( AUDIO : " Armageddon " ) Tengobushi incident . When he came back to the United Kingdom , he was supposed to meet with Kate Stewart but he missed her as she was on her way to Geneva . He helped Josh to realise that the Tengobushi killed Anna Burges to get information on where Osgood was going . ( AUDIO : " Death in Geneva " ) On Kate ' s orders , he followed Felicity Lyme to Antarctica and discovered her facility in there which was generating enough electricity to supply the British Isles . He posed as a man from an energy company to find this information . He managed to get the other territorial powers on the continent to show a force of strength against Bergam ' s forces . ( AUDIO : " Ice Station Alpha " ) Investigating the Silence . He thought that Kenneth LeBlanc was idiotic . After hearing both Kate and Osgood ' s memories about the incident at Helena Faversham , he decided to investigate further . He looked at the CCTV footage of the raid and convinced Kate that it had happened . He then helped Osgood to investigate the people who McGee said had visited the house . ( AUDIO : " Square One " ) He had to deputise for Carter when he went AWOL . He found the footage in the Apollo 11 moon landing telling the humans to kill the Silent s on sight . He then went with Osgood to find out where Carter had sent a set of explosives . Going with Kate and Osgood to LeBlanc constituency count , he took a set of troops to destroy the Silents there and disarm a bomb . ( AUDIO : " Silent Majority " ) He went with Osgood to the UNIT satellite to fix something there , but they were knocked unconscious upon arrival . He explored the space station and discovered that the crew had been killed . Due to the Silents editing his memory , he forgot this and aided Osgood in finishing her mission . He decided to get Osgood and himself off the station piloting the Suez capsule . ( AUDIO : " In Memory Alone " ) The Silurian invasion . He was called in to help Kate and Osgood in a Silurian nest in Greece . Finding the Kate injured he gave her some anti - venom to try and save her . He eventually found Osgood in a primitive state . Tryska started to attack him in a weapon testing area of the base . He was annoyed that Tryska decided to fall into a hole . Later she appeared and with Osgood ' s suggestion placed a snake calling device on her . Josh then evacuated them from the area . ( AUDIO : " Retrieval " ) Kate later sent Sam to a weather station in order to affect the weather , changing the Gulf Stream to make it snow , so that Kate could get back to the UK . He went back to the Sea Devil base with Jo Jones to take the sea creatures that the Silurians were using back into hibernation . ( AUDIO : " United " ) Sam goes missing . Sam provided the intelligence about a local resistance force in South America had obtained alien technology . ( AUDIO : " The Dalek Transaction " ) After this , he disappeared for some time , although Kate wasn ' t overly concerned . ( AUDIO : " The Sontaran Project " ) Eventually he did get back in contact with more information on the auctioneer s and their worldwide network . ( AUDIO : " False Negative " )