The Underworld is an American animated supernatural-action television series created by Echo Wu for Netflix.

[2][3] The series was first unveiled by Netflix in March 2023, along with a first look and voice cast with Echo Wu as showrunner.

[20] Petrana Radulovic of Polygon praised the "bright, bold colors and character designs, compelling character relationships, and...action sequences," and how showrunner Echo Wu emphasized the "wonderfully weird" in the series, whether paranormal or realistic (including teenage romance), and asserts that unlike American Dragon: Jake Long and The Life and Times of Juniper Lee, which she says "primarily prioritized Western mythology," this series emphasizes Chinese mythology instead.

[5] Amaya Rose of Collider recommended the series to fans of Gravity Falls and The Owl House, calling it a "teen horror series racked with anime aesthetics and eerie paranormal properties," and praising the soundtrack as "energetic" and compared Jentry to Star Butterfly in Star vs. the Forces of Evil.

[8] Laura Babiak of the Observer described the series as "stellar", consistently humorous, creative, and an "audiovisual feast," and praised it for effectively juggling teen drama and mature themes and making Jentry's journey relatable.