For additional background information...
This show was the first of the Eldoran Trilogy, 3 loosely connected shows that all revolved around schoolkids, a giant Voltron-esque combiner mecha, and of course, monsters of the day. That ep is pretty far along the list, although Rajin-Oh is more or less a character show without a major plot building until the last few episodes.
http://www.furnation.com/Llewelyn/ha...html#Raijin-Oh