Zoids: New Century, or Zoids: New Century Slash Zero , is an anime television series created in 2001 by Shogakukan, Inc. It is the second Zoids series created, based on the range of mecha models produced by TOMY. The series was originally released in Western nations under the title Zoids, before being later rebranded as Zoids: New Century by Viz Media. It was the first Zoids series to be dubbed in English. In August 2014, a Blu-ray box set of the series was released in Japan. It optionally came with a limited-edition Liger Zero.

Zoids: Chaotic Century, simply titled Zoids in Japan, is the first of five anime series based on the Zoids range of mecha model kits produced by TOMY. It is loosely adapted from the manga series Kiiju Shinseiki Zoido, which was created by Michiro Ueyama and published in CoroCoro Comic. The series was animated by Xebec, and aired from September 4, 1999, to December 23, 2000, on TBS and Network. Although the first series to be produced for the franchise in Japan, Chaotic Century was the second series to be dubbed and aired in Western nations, following Zoids: New Century. In August 2013, a Blu-ray box set of the series was released in Japan, it optionally came with a limited edition Blade Liger.