Looking at Wote's cool Lego figures with domed helmets reminded me of two friends of mine of the domed variety. Probably the earliest transparent domed helmet figure I recall is Mysterio, above, an early arch-villain and foe of Spidey. Here's the cover of his debut comic from summer 1964.
The second of my domed pals was a favourite toy back in the Sixties, Xodiac, The Man from Saturn and a member of the fabulous Colorforms Outer Space Men, which to my mind were the pinnacle of space toy design and production. The backing cards were also superb and Xodiac's was no exception. I particularly loved the picture of him with his flying device, which looked like a neat Sixties lampshade.
Were there any other domed helmets in the toy or comic world?