K9 (The Choice)

A version of K9 travelled with his Mistress in Ecto-Space. (AUDIO: The Choice, The Search)

Behind the scenes
Bob Baker and Dave Martin gave BBV Productions permission to use this K9 for Adventures in a Pocket Universe. The story implies, but does not confirm, that this version of K9 is in fact K9 Mark II, who had remained in E-Space with Romana II after the events of Warriors' Gate, while the Mistress is implied to be Romana herself.

Because BBV no longer had the rights to use the character of K9, the 2022 novelisation of The Choice replaced his role in the plot with a different mechanical creature, the bionic ferret B.E.S..