Karen Gillan(I)

Shaved her head completely bald to play Nebula in Guardianes de la Galaxia (2014). Marvel Studios subsequently turned her shaved hair into a wig and presented it to her as a gift which she still keeps to this day.

[discussing Amy's relationship with the Doctor] She (Amy Pond) doesn't take his (the Doctor's) word as gospel and she's always happy to challenge him. If he tells her to do something then she won't necessarily do it, she might go off and do her own thing which can sometimes create a rift between the two of them! They are best pals though and it's a very up and down relationship because they are both very passionate people.