In the 22nd century, Reploids became commonplace after Dr. Cain rediscovered Dr. Light`s old lab and based several designs off of Dr. Light`s original, called Megaman X. X, meanwhile, has joined the Maverick Hunters, and works with unit leader Zero under the command of General Sigma. It is their job to terminate rogue Reploids, those who have become violent.
- Other Title: Irregular Hunter X: The Day of Sigma, Irregular Hunter X, MegaMan Maverick Hunter X: The Day of Sigma, イレギュラーハンターX, Megaman X – The Day of Sigma
- Status: Completed
- Sub/Dub: Anime Sub
- Anime Type: OVA
- Genres: Action, Game, Sci-Fi, Shounen, Mecha, Comedy, Animation, Science Fiction
- Characters: Rockman X, Sigma, Zero
- Score: 7.18
- Rank: 3220
- Popularity: 5594