** Creator/KenjiOhba (''Series/BattleFeverJ'', ''Series/DenshiSentaiDenziman'') is Gavan.
** [[Creator/ShinichiChiba Sonny Chiba]] is Voicer, Gavan's father.
** Space Sheriff Alan who appears for a few episodes is played by HiroshiMiyauchi. Best part? Shows up wearing a variation of his [[Series/KaiketsuZubat Ken Hayakawa]] outfit.
** Mimi's prospective biker boyfriend [[spoiler:and Double Monster of the Week]] in Episode 17 is played by Shinji Todo, better known to fans as the [[Series/SpiderManJapan Emissary From Hell...]]
* TheOtherDarrin: After episode 10, ShozoIizuka came down with bronchitis (which is a disease that loves to infect actors and singers) and called in SuspiciouslySimilarSubstitute Creator/TakeshiWatabe. However, Iizuka would return in an even more memorable role in ''Series/SpaceSheriffSharivan'' as the [[ShapedLikeItself psychotic]] Psycho.