Knight Street No.9 (骑士街9号) is StarTrail’s flagship AI-animated series, co-produced with China International Communications Group (CICG), one of the country’s highest-level publishing and communications institutions. It adapts the hit audio drama of the same name, a title whose original run has drawn over one hundred million plays on Ximalaya, China’s largest audio platform.
That one sentence carries the two facts that shape everything about how the series is made: the source material arrives with a massive, opinionated audience, and the co-producer holds work to a national-institution standard. Neither has any patience for “impressive for AI.”
Adapting sound into image
Most adaptations start with too much visual material. An audio drama is the opposite: a hundred million plays’ worth of expectation and not a single authoritative image. Every listener has already cast the show in their head.
That made design the highest-stakes phase of the project. Character designs, the street itself, the series’ whole visual language had to feel inevitable to people who had only ever heard it. We treated the audio as the canon it is: pacing, atmosphere, and character dynamics were extracted from the performances before a single frame was designed, and the visual development was reviewed against what the drama’s audience already believes about this world.
What a state co-production demands of an AI pipeline
Working with a co-producer like CICG changes the definition of done. Delivery is not a demo reel; it is a broadcast-standard series with consistent characters, coherent spaces, and a look that holds from the first episode to the last.
For an AI pipeline, that translates into three disciplines. First, character consistency at series scale: the cast must remain unmistakably themselves across thousands of shots, which is where our per-title post-trained models do their work. Second, spatial coherence: Knight Street is effectively a character, and the geography of the street, its shops, doors, and sightlines, has to survive every camera angle, so the environments are built as reusable, consistent spaces rather than shot-by-shot backdrops. Third, editorial accountability: every AI-generated frame passes through the same review chain a conventional production would run, because a co-producer’s standard does not bend for the method of manufacture.
Why series are the real test
A beautiful AI short proves a team can polish. A series proves a pipeline can repeat itself: same characters, same world, same quality, episode after episode, on a schedule agreed with a partner who publishes for a living. That repeatability, far more than any single stunning shot, is what we believe separates AI animation companies from AI animation experiments. It is also why we took on a title with an audience this large: the fastest way to find a pipeline’s weaknesses is to make something for people who already care.
Knight Street No.9 is in production. The craft decisions behind it, from voice-first design to series-scale consistency, are the same ones we bring to every adaptation on our animation line.
StarTrail is an AI-native content studio producing AI live-action film & TV, AI animation, and AI commercials, built on its proprietary full-stack AI production pipeline. Its work has been recognized at the iQIYI Nadou AIGC Venture Summit, the Beijing International Film Festival, and the AAFF International Ark AI Film Festival. Learn more at startrailai.com.