MacArthur is a contestant on Total Drama Presents: The Ridonkulous Race. Her teammate is Sanders.
Competitive and brash, MacArthur plays the "bad cop" of the duo. She is not above abusing her power into breaking a few rules in order to win. She is known for being an aggressive person as well as being a control freak; when she wants to get something done, she will complete it whatever the cause. This ranges from commandeering a taxi from its driver, to giving a ticket to Sanders for "excessive complaining" and passing gas right in front of her partner. MacArthur is proud of her physical skills and often teases her partner for being weaker than her. Despite this, MacArthur is not without a code of honor as she is still willing to uphold the law. She would never leave a man behind as seen when she carries Sanders on her shoulder several times whenever Sanders is unable to walk. After accidentally getting Sanders injured, MacArthur begin to see the consequences in her actions and become more in control of herself.