Kaiketsu Lion-Maru (快傑ライオン丸 Kaiketsu Raionmaru?), The Vigilant Lion Knight (or literally translated as Swift Hero Lion Maru), was a Japanese tokusatsu television series in the Lion-Maru franchise that aired in 1972-1973, produced by P Productions and set during Japan's Sengoku period (the Age of Warring States).
During the late 16th century, a trio of ninja orphans are wandering Japan and saving people from evil by battling a villain of the week in each episode.
The series was broadcast in Italy in 1983, dubbed as Ultralion, and in Brazil under the title Lionman. The series was also dubbed into English, but only one episode (the first) surfaced in North America, released on a VHS tape in the 1980s, entitled Magic of the Ninja and sold through toy store chains such as Toys R Us.
In P Productions' publicity materials for the 2002 DVD release, Lion Maru was subtitled The Beast-Transformed Ninja Warrior.