Battle Beneath the Earth (1967)
A Chinese general goes berserk and has a system of tunnels dug all the way from China to USA, under the Pacific Ocean. The man who has discovered this is locked up because they think he is insane. US Navy soldiers go underground to repel the invaders.
Yvonne Craig in The Good Guys (1969) episode - Communications Gap
Kiss Me Quick 1964 Sterilox, asexual ambassador from a distant planet, comes down to earth…