"Carole & Tuesday" is set in a futuristic version of Mars, where humanity has colonized the planet and technology dominates daily life. The story centers on two young women from vastly different backgrounds who form an unlikely musical partnership. Carole Stanley, a street-smart orphan working part-time jobs in the bustling metropolis of Alba City, meets Tuesday Simmons, a sheltered and wealthy runaway from a politically influential family. Bonding over their shared love of music, the two decide to pursue their dream of becoming musicians together.

The narrative explores their journey as they navigate the challenges of the music industry, from writing songs and performing in small venues to gaining recognition in a world dominated by AI-generated music. Their collaboration attracts the attention of various individuals, including Angela Carpenter, a talented but troubled singer managed by her ambitious mother, and Gus Goldman, a washed-up former music manager who becomes their mentor. As Carole and Tuesday rise in popularity, they face competition, personal struggles, and the pressures of fame, all while staying true to their artistic vision.

The series delves into themes of creativity, identity, and the human connection in a technologically advanced society. It also addresses broader social issues, such as immigration, political corruption, and the role of art in shaping culture. The music, a central element of the story, is performed by real-life artists and spans multiple genres, reflecting the diverse influences of the characters and their world.

Throughout the series, Carole and Tuesday’s friendship is tested by external forces and internal conflicts, but their shared passion for music remains a constant. Their journey culminates in a high-stakes music competition, the Mars’ Brightest, where they must prove their talent and resilience against formidable opponents. The story balances personal growth with larger societal commentary, creating a narrative that is both intimate and expansive.