Leviathan

Leviathan is a twelve-episode original net animation that reimagines World War I through a science fiction lens, blending steampunk aesthetics with biological engineering. The series completed its run during summer 2025, telling the story of two protagonists from opposing empires—Alek, a runaway Austro-Hungarian prince, and Deryn, a British girl concealing her identity while serving in the Air Service—who find themselves aboard an extraordinary airship constructed from living, genetically engineered creatures. This adventure series explores the collision between duty and personal conviction as the characters navigate a conflict far larger than their individual circumstances.

The twelve episodes aired as a complete season, making it accessible for viewers seeking a contained narrative arc rather than an ongoing commitment. Leviathan combines mecha and sci-fi worldbuilding with genuine character-driven storytelling, appealing to fans of speculative fiction who appreciate historical reimaginings with a fantastical twist. The story's focus on identity and survival against a backdrop of mechanized warfare gives it weight beyond typical action-adventure fare.

Available now in its entirety, Leviathan offers viewers the rare opportunity to experience a finished animated series without waiting for subsequent seasons.