Leviathan
What is Leviathan?
Leviathan is a twelve-episode ONA that debuted in summer 2025, adapting Scott Westerfeld's acclaimed novel into an animated adventure series. The story reimagines World War I through a steampunk lens, placing its protagonists—an Austro-Hungarian prince on the run and a young woman masquerading as a soldier—aboard a living airship constructed from genetically engineered creatures. The series has completed its initial run, making all episodes available to watch in sequence.
The show blends mecha, sci-fi, and adventure elements into a narrative that prioritizes character development and moral complexity over straightforward military conflict. Alek and Deryn's meeting aboard the HMS Leviathan sets them on a collision course with historical upheaval, forcing both characters to reckon with loyalty, identity, and their role in reshaping the world around them. The fantastical premise grounded in historical setting creates something distinct from typical wartime anime.
This series appeals to viewers seeking coming-of-age storytelling within larger-scale conflicts, as well as fans of biopunk worldbuilding and character-driven science fiction. The completed twelve-episode count means there are no ongoing waits between releases—the full story is ready to watch immediately.
Set in a war-torn reimagining of 1914, Leviathan follows Alek, a fugitive prince of the Austro-Hungarian Empire, and Deryn Sharp, a daring young girl disguised as a boy to serve in the British Air Service. When fate throws them together aboard the HMS Leviathan, a massive, living airship made from genetically engineered creatures, they embark on a world-changing adventure that will challenge everything they know about war, loyalty, and identity. (Source: Netflix)
Episode Schedule
Frequently Asked Questions
- What is the latest episode of Leviathan?
- The most recent episode is Episode 1, which aired on July 10, 2025.
- How many episodes does Leviathan have?
- Leviathan has 12 episodes.
- When did Leviathan come out?
- Leviathan premiered on July 10, 2025.
- Is Leviathan finished?
- Leviathan has finished airing and every episode has been released.