Smith and Jones

Russell also decided to acknowledge his original plans for the Doctor's companion by introducing an investigative journalist named Penny Carter.

One of the episode's key set pieces, the Doctor and Donna's escape via a window washer's cradle, had previously been planned for the Doctor and Martha in Smith and Jones, but had been removed due to the script's excessive length.

Eager to provide Donna with a reason to return to modern-day Earth, Russell decided that her parents, Jeff and Sylvia Noble, uh, would feature more in Series 4.

By early September, actor Howard Atfield and Jacqueline King had agreed to return.

Uh, was just, yeah, mums, eh? Um, the opening scene actually is everyone's...

The Doctor and Donna Doctor are walking down the, the streets of London.

Actually reminded me a little bit of Smith and Jones and actually put me at ease.

It was like, you know, we know where we are.