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After becoming a viral sensation, identical twins Carine and Frances land in couples therapy as the world’s most co-dependent non-couple. The session erupts into a hilarious musical intervention and a reckoning that threatens to collapse their lifelong duet. Best known as @thegilberttwins to their 3M+ followers online, Carine and Frances return to their musical theatre roots with their original score co-written by Shona Maule. Loud, ridiculous, and unexpectedly heartfelt, this new musical comedy explores the chaos of sisterhood, online pressure, and the search for your own voice.
This is an archived listing from the 2026 Edinburgh Festival Fringe. Under the Influence is by The Gilbert Twins and Speakerphone Productions, listed under Musicals and Opera in the Fringe programme. It plays at Underbelly, Bristo Square, Teviot Place, EH8 9AG, 5 August to 30 August.
The show runs 60 minutes and is suitable for ages 14+. Tickets from £9. Content warnings: Strong language.