Intrusion Countermeasures Group The Intrusion Countermeasures Group - ICMG or simply Counter - Measures for short - was a secret arm of the British military which acted as a predecessor to UNIT , intended to take action against covert threats to British soil . It operated during the 1960s , with a base in Maybury . The ICMG had a complicated charter , which included the power to remove suspected aliens from ' hazardous material ' . ( AUDIO : " The Fifth Citadel " ) History . The ICMG was formed in 1961 under the command of Group Captain Ian Gilmore . He drafted scientific specialists like scientist Rachel Jensen under the Peacetime Emergency Powers Act . The Intrusion Countermeasures Group was composed of Royal Air Force personnel and equipment . While primarily from the RAF Regiment , ( PROSE : " Who Killed Kennedy " ) it also drafted in British Army personnel . ( TV : " Remembrance of the Daleks " ) At 76 Totter ' s Lane in London in November 1963 , the group encountered the Seventh Doctor and Ace , whom its members later assisted in defeating both the Renegade and Imperial Dalek factions who were searching for the Hand of Omega . This event became known as the Shoreditch Incident . ( TV : " Remembrance of the Daleks " ) Despite their success in the Shoreditch Incident , Counter - Measures still had funding issues and its men were often ' loaned ' to other departments ; Sir Toby Kinsella , Counter - Measures ' benefactor , informed Gilmore that as their work was by nature secretive , it was difficult to convince the government of their worth . They came to prominence after the assassination of Defence Secretary Stephen Mulryne . Sir Toby ordered an investigation , nominally to show Counter - Measures ' skills but also likely as Mulryne was secretly an old friend . In the process , Gilmore and Allison Williams - with the aid of the organisation ' s former scientific adviser Professor Rachel Jensen and the Doctor - uncovered a plan by , alien infiltrators inside the government , to wipe out the US and USSR , leaving Britain the sole power ( and under their control ) . Counter - Measures and the Doctor prevented the atrocity and the assassination of the Prime Minister , Alec Douglas - Home . The organisation was reinstated by the government and a funding bill introduced in parliament , though it took several months to go through . ( AUDIO : " " ) As soon as Counter - Measures started up , Sir Toby would quietly squirrel away its confiscated technology in case he needed it for other purposes . ( AUDIO : " Clean Sweep " ) After working with Counter - Measures once again as a consultant , the organisation ' s former scientific adviser Professor Rachel Jensen accepted the offer of Sir Toby Kinsella to join it permanently - on the condition that she was supplied with the facilities to continue her research on site and that she would replace Gilmore as its leader . However , she assured him that she would defer to his judgement in all matters of security . ( AUDIO : " Threshold " ) While Gilmore was initially bitter that Rachel had replaced him , he eventually came to respect her not only as a scientist but as his superior officer as well . ( AUDIO : " Artificial Intelligence " ) Countermeasures quickly became an organisation that many people wanted to have control over , due to the amount of advanced and alien technology the Group could have access to . ( AUDIO : " Changing of the Guard " ) Following the key role that its members played in defeating the military coup led by General Peters against his government in 1964 , the recently appointed Prime Minister Harold Wilson arranged for Counter - Measures to be fully funded until 1969 . ( AUDIO : " State of Emergency " ) Despite this , Sir Toby still lacked a place in the nuclear war bunkers as a result of being with Countermeasures : he darkly suggested that the government didn ' t care about alien invasion after World War III as they ' d be glad of any help they could get . ( AUDIO : " The Fifth Citadel " ) In early 1965 , Sir Charles Waverly attempted to gain control of Countermeasures through underhanded means and put his child ( under an alias ) in charge . This was prevented by his murder , with Sir Toby ' joking ' that he ' d have killed him if aware . ( AUDIO : " Manhunt " ) Sir Toby later used Countermeasures as a cover - lying to them in the process - for dealing with a renegade bunker . ( AUDIO : " The Fifth Citadel " ) After that , they were used to extract a defecting Russian psychic from Amsterdam . This turned out to be a conjob by the Soviet Union to smuggle a " psychic bomb " to London and Countermeasures only stopped it at the last second . ( AUDIO : " Peshka " ) Their next major operation in 1965 was to stop a British eugenic ' s programme " super - soldier " , Ray Carver . In the process , it came out that Sir Toby had been trying to keep them out - he was himself involved in the programme and Ray was his son - and their overseer was subject to a parliamentary inquiry . ( AUDIO : " Sins of the Fathers " ) While this went on , his aide Templeton was in charge and attempted to fix the inquiry so he ' d remain the boss . A draconian , micromanaging figure , he infuriated his staff and interfered with their investigation into the gangster Cool Kenny White - when this put Allison Williams at risk , Countermeasures took action without him . Sir Toby was exonerated and Templeton booted out , with William Heaton MP remarking that Templeton just wasn ' t capable of managing this sort of operation . ( AUDIO : " Changing of the Guard " ) By 1965 , Counter - Measures had numerous test animals , including a monkey named Darwin . ( AUDIO : " The Forgotten Village " ) A disastrous operation involving a Soviet satellite left Allison Williams with severe memory loss and Jensen disillusioned with Sir Toby . ( AUDIO : " The Forgotten Village " ) This was exploited by enemy agents who faked an alien incursion in East Germany , drawing out Countermeasures so Jensen could be mind - controlled into being one of their sleepers . Gilmore was arrested in East Berlin , Sir Toby potentially shot as a British spy , and Allison was also mind - altered by Templeton , in league with the enemy and in control of the Group again . ( AUDIO : " Unto the Breach " ) Allison and Jensen continued to work fo Counter - Measures , believing Sir Toby and Gilmore were still there ; most servicemen were replaced so they couldn ' t identify the fake Gilmore . ( AUDIO : " New Horizons " ) The enemy turned out to be sleeper agents , trying to destroy the planet to cover up the Light ' s existence . William Heaton and his men , surviving Light members , reassembled the ICMG team to thwart the " Light Sleeper s " . Sir Toby , Jensen , Williams , and Gilmore successfully defeated the Sleepers and were immediately after marked for death by Heaton . ( AUDIO : " Rise and Shine " ) After developing a way to detect - and kill - the Light , the Group defeated Heaton . During the affair , Sir Toby had attempted to strike a deal in the hope of protecting his agents but when it became clear that the rest of the surviving Light would keep coming after him as long as Countermeasures existed , he had it quietly shut down and pretended to arrange for Jensen , Williams , and Gilmore to die in bombings . All three were given fake identities and with the Light assuming Kinsella was bought off , he was able to quietly identify and exterminate them . ( AUDIO : " Clean Sweep " , " Who Killed Toby Kinsella ? " ) In December of 1973 , the team was able to come back from the cold and New Counter - Measures was started . ( AUDIO : " Who Killed Toby Kinsella ? " ) Afterwards , a still - living Gilmore had argued for greater funding and resources to make a more permanent ICMG but failed . ( PROSE : " Who Killed Kennedy " ) Before UNIT formed , Gilmore would inform his spiritual successor Alistair Gordon Lethbridge - Stewart about the Group ' s history . ( PROSE : " Downtime " ) In the early 1970s , James Stevens attempted to investigate and make public information concerning this group , as well as UNIT , but was stymied in doing so . ( PROSE : " Who Killed Kennedy " ) In later years , Gilmore would be able to publish his memoirs ( AUDIO : " " ) and the 2006 book " The Zen Military " could reveal UNIT ' s origins in the Group . ( PROSE : " Remembrance of the Daleks " )