the first Super Sentai, which is also the last time the five heroes wore different costumes. naturally, Battle Robo is the first sentai robot, and it's really one of the most impressive one that Toei has ever done.
this clip seems to focus on Miss America, which is not a bad thing. the subs are from the Hawai'in broadcast from the early 80s. I've heard that there was a near complete set of the series out there, but I've yet to see evidence of it. maybe it will show up eventually.