Der Kurier des Zaren
Verne went to d'Ennery with the idea in February 1880, and they collaborated in Antibes for several weeks on two projects simultaneously: the dramatization of "Michael Strogoff" and the new play. "Journey Through the Impossible" was the only one of their collaborations not based directly on a pre-existing Verne novel. Modern scholarship has not been successful in determining how much of the play each of the collaborators wrote, but the Verne scholar Robert Pourvoyeur has suggested that the play is clearly founded on Verne's ideas and therefore can be treated as being mostly the work of Verne.