Thanos clearly has a thing for bald women. In the Marvel comics universe Moondragon was born on Earth as Heather Douglas, but then whisked off into space by Thanos after he killed her parents. On Titan she was raised by the monks of Shao-Lom who expanded he mind to such a degree she developed superpowers. She has been a member of the Guardians Of The Galaxy (as well as the Defenders and the Avengers) in the comics so it’d be nice to see her in the films, kicking Nebula’s butt.
Former model and Miss India Persis Khambatta shaved her head to play Ilia the the Deltan navigator of the Enterprise in the first Star Trek movie.
Natalie Portman as Evey Hammond starts the film with a full head of hair but has it forcibly shaved off after she’s kidnapped and accused of treason.
Does it count as bald if you’re a robot? Who cares? Ava looks bald, that’s good enough for us, and it gives us a chance to mention once again that Ex Machina is possibly the best SF film of the last 10 years. So if you haven’t seen it yet, you need to rectify that situation. Alicia Vikander is simply stunning as Ava.
Ripley (Sigourney Weaver) has a date with the clippers when she winds up in a penal colony where everyone’s shaven to prevent head lice infestation. Apparently the bald vibe was a leftover from an earlier draft of the script in which the setting was a space monastery.
In many ways Defiance was a spiritual successor to Farscape, so it’s no surprise it had a bald alien too. The post-apocalyptic frontier town’s quack was the acerbic and entertainingly grumpy Indogene Doc Yewll, played by Trenna Keating.
All the Minbari are bald in Babylon 5… except Delenn (Mira Furlan) after season one when she emerged from a chrysalis half-human and with flowing locks. We actually preferred her full Minbari look.