New Times In Old London

"New Times In Old London" is the first episode in the ninth season of Doctor Who, set on Earth. It is the first episode to not feature Isabella Cartwright after her death.

Synopsis
"Isabella's gone, Billy. We just have to move on, that's what we always have to do" - The Doctor

The Doctor and Billy return to Earth lamenting the death of Isabella, where the Doctor receives a distress signal. Here they encounter the mysterious Stranded, trying to return to their own planet. But after the Doctor realises that their planet was destroyed millennia ago, he is faced with the knowledge that the Stranded will seek Earth as their new dominion. However he is shocked by their calm reaction, and discovers that the Stranded must leave Earth before it is destroyed by their presence.