stand-in
/ˈstændˌɪn/
noun
stand-innoun
/ˈstændˌɪn/дублёр
a person who takes the place of someone else for a period of time
  • The actor was sick, so they used a stand-in for the scene.
  • Being a stand-in in movies can be a dangerous job.
From the textNathan is Natalie's stand-in,