I suspect that what you are talking about here is 'Space Opera', a subgenre whose major avatar is 'Star Wars'. This genre takes the tropes of High Fantasy and puts them in a futuristic or alien setting.

Thus Star Wars with its' sword-wielding warrior wizards (Jedi), armoured Stormtroopers, Golems (droids), Giants (Wookiees), Black Knights (Darth Vader, Kylo Ren) and evil sorceror overlords (Palpatine, Snoke), is basically a space-going LOTR or GoT.

The same thing applies to 'Doctor Who', the Doctor being an itinerant wizard, immortal and with uncharted powers, who travels around righting wrongs with a rag-tag bad of companions. The reboot strengthens this by enlarging the companions from mere audience identification cyphers to more developed character capable of functioning independently of the Doctor. With the Evil Counterpart (The Master), the Dark Lord (Davros) and his horde of minions (the Daleks), plus a few Vampires (Cybermen), an Ancient Race (Silurians) and a Warrior Queen (River Song) the tale is complete.

The ultimate Space Opera is, of course, Warhammer 40 000 (WH40K), the table-top wargame and computer game franchise, chock-full of savage Orks, mystical Eldar, Undead Necrons and so on to challenge the Imperium of Man and its stalwart guardians, the armoured, chainsword-wielding Adeptus Astartes - Space Marines.