The synopsis from the Tezuka webpage says this is a remake of #11 [(18)], Time Machine, but in my opinion, it is more of an act of desperation. I think they were shorthanded of animators that week of May 22, 1965, when this was broadcast, & they cobbled together a story using not just cels from earlier episodes, but entire clips from them.
FROM MY NOTES:
Shares scenes with #11 (18), Time Machine & #69, Rebellion of the Dinosaur People (59, Dinosaur Dilemma)
Wrecks Higeoyajis house
Uses frames from #29, Memorable Day (Memory Day)
Not merely influenced by Welles' Time Machine, but using imagery straight out of it, as in these next two frames:
Back to #68. For those who know little of the B&W series, but are familiar with the 2003 series, the following part was used as the basis for the Franken episode:
Compare Kazuske-kun or, perhaps Karusuke-kun (Disko Teck :lol to Fujimoto Taku (Jack Fuller) on the 2003 Franken episode. Both were separated from the group & captured by the marauders.
appears in a frame from this clip of the crowd fleeing, but I do not have it in the frames from this episode.
Compare Hanako-Sensei (Miss Ann Thrope ) with Midori-Sensei (sorry, I have no data on her dubbed name). Hanako-Sensei seems shaped more like a mother, while Midori is more like a big sister.
BTW, unlike more than a few, perhaps most characters given pun names by Ladd & co., Miss Ann Thrope does not live up to her name.
BTW, does appear as both a boy & a man in #69.