Some time after the Department was created, the dictator of the British government, Lomax, needed an ally on Earth and came to Thorne. Lomax was secretly plotting the invasion of Earth by his own kind, the Korven. Thorne had a personal policy to be on the winning side. He was implanted with Meron DNA by the Korven, effectively turning him into a Meron. (TV: The Eclipse of the Korven)
When Starkey and Darius Pike were held in Dauntless Prison while trying to track the Jixen, Thorne personally threw them in a cell with Mr Wiffy. When Inspector June Turner, head of the Alien Activities section, visited the prison, Thorne denied she had any authority. When the Jixen rioted through the prison, Thorne locked himself and June in his office. However when she found out K9 was in the prison she unlocked the door herself. She promised Thorne that he would "never darken these doors again". As she left, Thorne promised she would pay for this one day. (TV: Liberation)
Thorne set his sights on an Ukkan library card held by the Department. Prisoners were rising in numbers and he wanted to use Ukkan technology to dump them on Urlic, a prison which required "no upkeep, no wardens, no exercise yard, no ping-pong tables, no parole," forever. He decided the first inmate would be Starkey who was at the Department HQ's first careers day. When Starkey saw the card's screen in Thorne's office, he was sucked into it. An Ukkan librarian, Yssaringintinka, arrived to assist him. June reported to Lomax and warned Thorne that he wanted a good explanation as to why Thorne interfered with alien technology, which she thought insane.
With the help of John, a former Department custodian and vice-president of Greenroom Entertainment he used the last Etydion in a plot to telepathically control children, which backfired. (TV: The Custodians)
Gryffen told June that he needed to get to the site of the crashed fallen angel in Canada as he could get the Space-Time Manipulator working properly if he acquired the temporal stabiliser. Thorne informed Lomax of this, and interfered with attempts to retrieve components from northern Canada. (TV: Angel of the North)
Thorne was at the Department Mobile HQ when the Last Precinct took over Gryffen Manor. He arrested, Pike, though K9 warned him to treat Pike with the respect he deserved or there would be consequences. (TV: The Last Precinct)
Thorne succeeded in acquiring K9's regeneration unit. (TV: Hound of the Korven). K9 determined that Thorne was working with the invaders when he found that he was being used to create a larger portal. When Jorjie branded Thorne a traitor to his entire planet, he revealed that he was implanted with Meron DNA by the Korven. He ordered Trojan to kill them all, starting with K9. K9 called the Jixen to do battle against the Meron. This caused Trojan's Jixen and Meron DNA to conflict. With its final breath, Trojan collapsed on Thorne, crushing him to death. (TV: The Eclipse of the Korven)
Thorne was ruthless and easily angered. When Thorne discovered his Ukkan library card was stolen, he condemned the CCPC guard to the Mortainian mines for twenty years. (TV: Lost Library of Ukko) He was stubborn, refusing to obey Yssaringintinka (TV: Lost Library of Ukko) or give in to John's demand for fifty million credits. (TV: The Custodians) He had little humour, although he made a joke to a frustrated Yssaringintinka. (TV: Lost Library of Ukko) He noted that a later joke was the only humorous thing he had said in his life, wasted on a department technician who didn't get it. (TV: The Last Precinct)