Under the Influence – King’s Head Theatre

Frances Gilbert, Shona Maule and Carine Gilbert in Under the Influence at the King’s Head Theatre, London. Picture: Danny Kaan

Under the Influence continues at the King’s Head Theatre, London until 26 September 2026.

Star rating: five stars ★ ★ ★ ★ ★

Couples therapy isn’t a strange concept, for couples of course. But twins in couples therapy? That’s a strange one even for the therapist. Yet, in The Gilbert Twins’ new musical, they certainly make it work.

The opening number ‘We’re Gonna Be Twins’ throws the audience straight into the sketch comedy humour demonstrated throughout the show, as Carine and Frances Gilbert perform a makeshift biology lesson and celebration upon discovering the fact they will be born as twins. Simple props used in this number and throughout, including ring lights and flimsy party hats, serve as a playful nod to the twins’ rise to fame as social media content creators.

The rest of the show sees the two performers (who have also penned the book and co-written the lyrics) attempting to rebuild their struggling relationship after years as housemates, co-workers, best friends and, of course, twins.

Numbers such as ‘Always There’ combine catchy and repetitive hooks, highlighting the pair’s acting background, while satirical songs such as ‘Influencer Era’ offer a self-deprecating dig at their social media careers and their impact on their lives.

The acknowledgement of the somewhat bizarre nature of ‘influencing’ and social media, while leaning into its stereotypical style of conversation and dialect, is something particularly enjoyable about the show. It definitely hits the mark with its honest, self-aware cringe lingo and humour.

The additional third character, therapist Kate (Shona Maule), really aids in highlighting the chaotic yet close-knit nature of the twins and their bond. Maule also makes a wonderful addition to the comedic nature of the show, with over the top outbursts and reactions, as well as impromptu keyboard accompaniments. Her musical skills are evident throughout, as she also takes on the role of co-lyricist, composer and musical director.

But the story extends beyond simple jokes, becoming a journey through a love that cannot be chosen and the fear of losing it. The chemistry between the twins clearly transcends beyond the stage.

It’s hard to tell what is true in the performance and what is not. Carine and Frances explore growing up and navigating life both together and apart, while highlighting the almost unbearable intimacy that comes with being so deeply connected to another person. It feels unfiltered, natural and completely real. Raw, stupid, open, honest and relatable.

One of the highlights has to have be the wonderful performance of the penultimate number ‘Mirror & Shadow’ by Frances. It is a beautifully raw exploration of identity, growing up together, individuality and companionship. It certainly brings a tear to the eye.

The show ends on a positive note, but one that still feels authentic. ‘Finale’ doesn’t offer a physical solution to the twins’ relationship, but instead focuses on the mental journey of understanding each other and themselves.

Despite being billed as a comedy musical, the production, directed by Georgie Rankcom, offers much more than laughter. It doesn’t need a complex set or elaborate costumes. It has a story to tell. At just an hour long, the show is short and sweet, but lingers long after the curtain falls, leaving a sense of nostalgia, reflection and love.

Libby O’Connell