Juliet's first voice acting role was as "Lumalee" in the 2023 Super Mario Bros Movie. Her father, Michael Jelenic, was the director of the film and initially brought his daughter in to do temporary "scratch" recordings for Lumalee, for use in storyboards and planning, until another actor was cast. However, the everyone on the production team loved Juliet's performance so much, they decided to use her recordings in the final film, rather than recast the role.
