Not bad, though I wish they'd had the characters speaking actual Japanese in the scenes that didn't involve the crew using translator pills. Nate using colloquial English in scenes where he was supposed to be speaking Japanese was kind of distracting. (E.g. what's the Japanese word for "hardcore?")
Nice to see Sab Shimono, though the other guest actors weren't too impressive. The twist at the end, if anyone missed it, was that this is the Yamashiro family, no doubt the ancestors of Tatsu Yamashiro -- so the katana Ray was asking about is Katana's katana.
For folks trying to protect history from alteration, the Legends were pretty reckless with Japanese history, killing
Tokugawa Iemitsu some eight years early, if I read the date right. Although he was the first Tokugawa shogun whose reign ended in death rather than abdication.
I wonder where Ray goes from here. I assume that blowing up his Atom suit was an excuse to design a new Atom suit later, maybe a sleeker and less cumbersome one.
Good to get some backstory on Amaya, though I wonder how someone from an insular village in Africa mastered an American accent so quickly. (It wasn't clear when the JSA recruited her, but I'm not sure an American team would've had reason to be active in Africa prior to 1942. I guess it's possible they could've been there in the late '30s for some non-war-related reason, though.) As I said before, I wish the actress used her natural English accent, which would make more sense for someone born and raised in Africa.
Vixen didn't know that ninjas existed?
She believed they were a myth, which they largely are, although probably with some basis in truth. Honestly, I'm surprised she'd even heard of them, since the idea of ninjas wasn't really known in the West until the 1960s.
Real ninjas, if there were such things, wouldn't have worn black outfits, for one thing. Those were actually the outfits worn by stagehands in Japanese theater, with the cultural convention being that they were treated as invisible and absent by the actors and the audience. At one point, some playwright had the metatextual idea to have one of these "invisible" stagehands suddenly attack and kill one of the characters, revealing himself to be a ninja assassin. That gimmick caught on, and so the all-concealing black outfit became indelibly associated with the mythology of ninjas in theater and fiction.