Series 14 opener Space Babies takes the Doctor and Rubys travels to the distant future.
I think Ruby is scared of losing her family because theyre her world, says Gibson.
Theres some thematic overlap with the Fifteenth Doctors character traits, according to Gatwa.
Fear andfacing those fearsin various forms is often the bedrock of many a greatDoctor Whostory.
Death isnt the only wayto lose a companion.
Billie Pipers Rose and the Doctor were separated by living in different dimensions at the end of Doomsday.
This is particularly true in episodes set in outer space.
Hes scared of Ruby, says Gatwa.
I think hes nervous about letting people into his life, who are the people that can challenge him.
She might notscarehim, but certainly hes like, I cant mess around with you sort-of-thing.
Fifteens hesitation to let Ruby in at first doesnt at all signal the end of their characters development.
The Doctor and Ruby as the season progresses will develop a beautiful, platonic relationship, Gatwa said.
Theyre two best friends, that are both curious, and also have a cheeky streak in them.
They both have that energy to them.
They just cant help themselves but get into trouble, but theyve got hearts of gold.
