In this American TV-movie version of a 1970s Japanese scifi TV series, three visitors from modern Japan -- a woman, a boy and a girl -- find themselves in a future which is almost exactly like our time, except that intelligent gorillas are in charge. They meet a lone man who struggles to carry out a solitary existence, and there's a flying saucer that shows up occasionally to act as Deus Ex Machina.
How did they get there? It's unclear. How will they get back? No idea. What can they do to survive? Well, not much, except the boy occasionally helps to divert attention while the man sneaks around to clobber them. There's a subplot about the military ape leader wanting to kill the human man because he thinks the man killed his wife and son. Otherwise, the only noteworthy thing about it is the sheer number of ape costumes on display. Even for the kid's adventure show it apparently was at some point, awful.