Eiyuu Densetsu: Head On! Master Senshi
Japanese title: 英雄伝説　ヘッドオン！マスター戦士
Alternative titles: Heroic Legend: Head On! Master Warriors, Transformers Headmasters Episode 38
Type: OVA
Source: Other
Episodes: 1
Status: Finished Airing
Aired: Not available
Duration: 25 min
Rating: G - All Ages
Studios: Toei Animation
Genres: Sci-Fi
Themes: Mecha

Transformers Heroic Legend was a VHS promo released at the end of Transformers Headmasters. The tape contained 3 episodes covering the major plots of the previous 3 series in Japan (Tatakae! Chou Robot Seimeitai Transformers, Tatakae! Chou Robot Seimeitai Transformers 2010, and Transformers Headmasters). 

Only the 3rd episode, Eiyuu Densetsu: Head On! Master Senshi is counted in this entry as it recaps Transformers Headmasters, an anime produced and animated in Japan. The first two episodes recap an American production of Transformers and thus do not count towards in this entry.

(Source: tfraw and tfwiki)