Hurtling through time and space, K-9, one-time companion to a Lord and Lady of Time, arrives in mid 21st century London where he valiantly defends a group of children and an inventor from unwelcome alien hitchhikers. Forced to self-destruct, K-9 regenerates into a new form, but is left without many of his memories. Stranded in this period, he teams with Professor Alistair Gryffen and his young charges to combat threats on and off-world.