Ncuti Gatwa and Millie Gibson wont ever forget their creepy jelly baby co-stars.
Warning: contains spoilers forDoctor Whoseries 14 episode 1 Space Babies.
The new series ofDoctor Whobegins with The Doctor and Ruby encountering an abandoned spaceship that doubles as a daycare.
The babies sit in computerized strollers while a computerized nanny takes care of them.
Gatwa and Gibson describe Space Babies as the most technically challenging episode they filmed in series 14.
The dolls apparently had an awkward plastic feel to them.
It was just horrendous, says Gibson.
While the real babies are easier for actors to hold, their age obviously limits their ability to act.
You cant control their movements, theyre not professionals, Gatwa says.
The actors and crew can prompt the babies to laugh, but they may cry instead.
We were acting alongside these fully dressed green men shaking the prams, Gibson says.
I cant act serious.
This is the most bizarre thing ever, it was so surreal.
Our beautiful first AD, Dan, was doing all the voices, Gibson remembers.
Bear in mind, Dan is a grown man, so his baby voice wasnt, Oh, Eric.
Oh, Ill help you.
It was like [slightly creepy tone], Eww.'
The Doctor and Ruby discover one lone human left on the spaceship.
Gatwa and Gibson had a much easier time working with Rosheuvel.
She was so cool to work with says Gibson.
Space Babies is currently streaming on BBC iPlayer andDisney+