Pearl Mackie admits she's scared of Doctor Who monsters!

The Doctor is back and he has a new companion.

Bill Potts, played by Pearl Mackie, is the new sidekick and Martin has been to meet her.

She tells him about being inside the Tardis, working with Peter Capaldi and about being scared of the monsters in series 10.

The new series starts Saturday 15 April at 7:20pm on BBC One.