An immortal jellyfish, inspired by romantic vampire stories, who conspires to destroy all life on earth: it certainly makes for an unconventional protagonist which ultimately confuses this show’s environmental message. Gracie’s initial love for humans, because of their stories, is replaced by a savage hatred. Through jokes about reproduction, hive-minds and comic conventions, the plot concludes with Gracie observing the first stirring of new life after the apocalypse.

The lightness of the dramaturgy and the wit of the script never quite grapple with the seriousness of the theme: the nuclear destruction seems almost an aside in Gracie’s self-obsessed journey to fulfilment. The show is filled with memorable incidents (animals sabotaging humans, a tragic death, an idyllic romantic interlude) but the ideas are never allowed to develop. The spectacular jellyfish costume and a winning performance from Zoë Bullock aside, the production ultimately offers an episodic script with an unsure message.

Gracie And The Start Of The End Of The World (Again), Assembly Roxy, until 26 August, 2.55pm.