featured in the Big Finish Productions series of Fourth Doctor Adventures – Mark II in Series 2 alongside Mary Tamm (Romana I), Mark I in Series 4 alongside Louise Jameson (Leela) and Mark II in Series 5 alongside Lalla Ward (Romana II) Online media In 2003, a webcast adaptation of the never-completed Shada serial was produced for the BBC's Doctor Who website, rewritten as an Eighth Doctor adventure and featuring the post-E-Space versions of Romana II and K9 Mk II. According to the official website for The Sarah Jane Adventures in 2007, the Doctor stored several presents for Sarah inside K9, including a "sonic lipstick" and a watch that scans for alien life. Video games K9 appears in the Lego Dimensions video game. He is part of the Doctor Who Level Pack as a rideable vehicle. Archive recordings of John Leeson's performance was used in-game as he was unavailable. Conceptual history K9 was the brainchild of writers Bob Baker and Dave Martin. Its purpose was to have a character that could narrate while the miniaturised clones of the Doctor and Leela were inside the Doctor's body during the events of The Invisible Enemy. Martin's own dog had also been recently run over by a car, and K9 was a car-proof tribute to it. K9 was not originally intended to be a companion, but producer Graham Williams liked the concept so much that the decision was made to retain him as a regular character, in order to appeal to the younger members of the audience. The original name for the character was "FIDO" – apparently from "Phenomenal Indication Data Observation" unit – but it was eventually named K9. The initial idea for realising K9 was to use a small actor inside a robotic Dobermann costume, but that was rejected in favour of a radio-controlled prop, designed by Tony Harding and made by the BBC Visual Effects Department. The Radio Control Model Centre in Harlington Middx owned by Derek Wales was commissioned to build the electronics into the first original basic shell and consequently the centre operated the dog on set for the BBC. The robot suffered from numerous technical problems during its time in the series, often malfunctioning because the radio controls interfered with the cameras and vice versa. On location, K9 also proved unable to traverse uneven terrain, and shots had to be conceived with this in mind. Workarounds included