[Sunred]

Maskman has the most confusing first episode. It almost feels like episode 13ish the way it starts off suddenly with Takeru/Red Mask and Mio running. No origin whatsoever last I checked so it confused me. The premise, an underground empire called Tube wants to take over the people upstairs, us. Thus the Maskman team is formed, a dream team consisting of experts in karate, kenpo, wushu, ninjutsu, and taichi who also can harness aura power during a fight. But the real plot is Takeru/Red Mask and his hero's quest to rescue his damsel in distress Mio aka Princess Ial.
Like I said before, Ryosuke Kaizu who was a guest role in Flashman as an aspiring boxer/food stall owner becomes the red ranger of the show. Issei Hirota who went on to appear in Jiraiya as Toppa was Akira/Blue Mask, the baby bro of the team and Wushu prodigy. In real life Hirota is a legit Wushu practitioner that he had some involvement in the wushu stuff if I recall and the Shishiranger suit actor took some advice from Hirota because of that. Another familiar face is Kanako Maeda who went on to play Kanna in Jetman after this.
Maskman was the first of the franchise to give all members their individual mecha components which combines to Great Five. Also the show was the testbed in a sense for the Tsuika Senshi trope started by Zyuranger and Dragon Ranger Burai in the form of the one-shot Bangai Hero X1 Mask.