- Country: Japan
- Genres: Action, Animation, Short
- Release: 2006-01-31
- Director: Atsushi Otsuki
- Writers: N/A
- Language: Japanese
- Stars: Tomohisa Aso , Angie Beers , Angie Beers , Ethan Cole , Ethan Cole , Carol-Anne Day , Carol-Anne Day , Daisuke Egawa , Dean Galloway , Dean Galloway , Mark Gatha , Mark Gatha , Lucas Gilbertson , Lucas Gilbertson , Brendan Hunter , Brendan Hunter , Ryûzô Ishino
- Runtime: 25 min
- Awards: N/A
- AKA: Mega Man X: The Day of Sigma (Canada) , MegaMan X: The Day of Sigma (United States of America) , Irregular Hunter X: The Day of Sigma (Japan) , Rockman X: The Day of Sigma , Rockman X: The Day of Sigma (Japan) , Mega Man X: The Day of Sigma (United States of America) , MegaMan X: The Day of Sigma (Canada)
- Plot: A Mega Man anime OVA that was created for the Irregular Hunter X video game for the PlayStation Portable.
- IMDB:tt4774186
Mega Man X: The Day of Sigma Cast · · · ALL
Atsushi Otsuki
Director
Takahiro Sakurai
X (voice)
Ryotaro Okiayu
Zero (voice)
Mugihito
Sigma (voice)
Tomohisa Aso
Dr. Thomas Light (voice)
Ryûzô Ishino
Chill Penguin (voice)
Hiroshi Shimozaki
Vile (voice)
Nobuyuki Kobushi
Hunter (voice)
Yumiko Kobayashi
Navigator (voice)
Eriko Kigawa
Operator (voice)
Yoshiaki Matsumoto
Operator (voice)
Hiroto Kazuki
Operator (voice)