Doctor Who: The Eleventh Doctor: The Memory Feast: Part 1

When the Sapling's mysterious visions led the TARDIS to a luxury space cruise liner orbiting a black hole, the Doctor was shocked to discover over a dozen Ood still enslaved onboard, who had turned on their masters! Further investigations revealed that they had been disconnected from the Ood Song due to the black hole, and the Doctor was able to free them, and return them to the Song, and their planet... now the journey continues.