Wikipedia There is more information available on this subject at Toei Animation on the English Wikipedia.

Toei Animation Co., Ltd. is a Japanese animation studio owned by Toei Co., Ltd. The studio has produced the anime versions of works by many legendary manga artists, including Go Nagai, Akira Toriyama and Naoko Takeuchi. In addition, the studio helped propel the popularity of the magical girl and Super Robot genres of anime; among Toei's most legendary and trend-setting TV series include the first magical-girl anime series, Mahoutsukai Sally the anime adaptation of Mitsuteru Yokoyama's manga of the same name.

Toei Animation also produced the only non-canon of the seven Halo Legends anime Episodes, entitled Odd One Out.