She first felt the power of the McCock in a sequel story to The Robots of Death, because Big Finish must absolutely make a sequel to every TV story ever; just you wait until you hear their sequel to The Awakening. She then met Eight in his past and got pissy over what he hadn't done yet, but then Molly says "You need to lerrn to trust the Dahktrr, he probably had a very good reason for doing what he did, lassie", to which Liv agrees and then ends up travelling with Eight for years on end. Apologies for being brief at this point, I'm only up to Dark Eyes 2 so far.