Episode Six of Torchwood: Miracle Day, The Middle Men, had a final official rating of 4.60 million viewers according to figures released by BARB.
The programme was the 18th highest rated on BBC One for the week.
The final result includes those who recorded the programme and watched it within 7 days. It does not include those watching on iPlayer.
Episode Seven, Immortal Sins, had an AI score of 81.