Sierra is the tritagonist of Total Drama World Tour. She is the obsessive Total Drama fan, especially Cody. She is in love with him but keeps stalking him, much to his chagrin. She have grandparents are German and single mother who have a crush on Chris Maclean. She returned as a secondary character in Total Drama All-Stars. She returned without Cody, much to her sadness. Sierra also appears in the audience in the animated/live-action game show Skatoony in each episode. Until Dakota's mutation in Total Drama: Revenge of the Island and the appearance of Jasmine in Total Drama: Pahkitew Island, Sierra was the tallest female contestant to appear on the show due to her Amazonian height (only DJ and Chef Hatchet, from the first-generation cast, and Jasmine and post-mutation Dakota are taller than she is).
- Cameron (one-sided, on her side)
- Cody (one-sided, on her side)
- Chris Mclean
- Gwen (one-sided, on Sierra's side)