Heisenberg’s doubt: a stark warning echoing today’s fears
Paapa Essiedu’s revived fascination with plays reflecting the present has landed us squarely within Michael Frayn’s 1998 drama, a chillingly relevant exploration of scientific ethics and looming global conflict.

A meeting of minds, and a shadow of trump
At its core, The Potential charts a desperate meeting in 1941 between Niels Bohr, the Danish physicist, and Werner Heisenberg, the German scientist, both wrestling with the implications of atomic discovery during World War II. The play, brilliantly brought to life by Richard Schiff, Damien Molony, and Alex Kingston, doesn’t shy away from depicting the moral compromises inherent in scientific advancement – and the terrifying potential for misuse.
The narrative, driven by a menacing, hard-right politician reminiscent of Donald Trump’s recent pronouncements on genocide, paints a disturbing picture. Frayn masterfully evokes the anxieties surrounding Hitler’s pursuit of nuclear weaponry, forcing us to confront the uncomfortable parallels between historical threats and contemporary geopolitical tensions. It’s a particularly unsettling resonance given the theatre’s own ROI production, tackling similar questions of scientific responsibility.
Longhurst’s production is undeniably handsome, meticulously detailing the complex equations that underpin the play’s second half – a significant departure from the impenetrable nature of Tom Stoppard’s Arcadia at the Old Vic. Yet, the script occasionally struggles to fully unpack the metaphorical weight of the scientific concepts, leaving moments of tension feeling somewhat fleeting. The chemistry between Bohr and Heisenberg, though rooted in their historical context – a 16-year age gap and a teacher-student relationship – feels curiously subdued, hindering the intended dramatic friction.
Alex Kingston delivers a standout performance as Margrethe, Bohr’s wife and editor, injecting a desperately needed dose of humanity into the proceedings. However, she’s often burdened with carrying the emotional weight of the narrative, while Schiff’s portrayal of Bohr occasionally falters with noticeable line flubs. The production’s aesthetic, anchored by Joanna Scotcher’s striking set design – a swirling, water-filled circle – effectively evokes the ‘heavy water’ crucial to the Nazi war effort, a poignant visual reminder of the play’s central themes.
Despite its strengths, The Potential suffers from a notable omission: the devastating realities of Nagasaki and Hiroshima are entirely absent from the dialogue, a glaring oversight considering the play’s exploration of the consequences of unchecked scientific ambition. The focus remains firmly fixed on the fear of nuclear proliferation, neglecting the horrific fact of its use. This historical blind spot dates the production, particularly in light of escalating US military posturing around the globe.
Ultimately,The Potential serves as a potent, if somewhat uneven, reminder of the enduring ethical dilemmas posed by scientific progress. It’s a chilling testament to the enduring power of doubt, and a timely reflection on the shadows that lurk beneath the surface of even the most brilliant minds.