Anne from DIY & Dragons reminded me earlier this week of some of the cool stuff from the Buck Rogers comic strip: namely things like the Org gangs and the anti-gravity belts they aware they allow them to make leaps like characters in wuxia films (or the Matrix movies). For the most part, these things are present in the novella that inspired the comic strip: Armageddon 2419 AD by Philip Francis Nowlan. It tells the story of
Yellow Peril racism is an unfortunate relic of the past, but I think it's pretty easy to get rid of that and keep the fun stuff. We can sub out the conquerors. Here are a few options.
Martians: Wells' War of Worlds takes place in the early 20th Century (probably 1907) so it's a bit early to fit the Armageddon 2419 AD timeline, but there have been other invasions like Killraven. Maybe John Christopher's Masters aren't Martians, but they have tripods just like them.
Apes: Maybe Moreau-tech touches off a Planet of the Apes scenario early? Or perhaps the 1918 Spanish Flu epidemic is followed by a plague that kills off dogs and cats, leading to apes between adopted as pets, then bred as servants, etc. That's always assuming the apes don't come from Mars.
Robots/Artificial Beings/Cyborgs: Capek's R.U.R. takes place around the year 2000, but discovers the android creating process occurs earlier, so it could work. Of course, cyborgs from a Tenth Planet are always an option, too.