The following YouTube search will bring up multiple playlists of full movies:
you can create your own too to help with your research (you could save features, documentaries etc as well as films/trailers).
The links below are for BBFC pages, explaining why they got this rating - all the same bar the last two...
Avatar, The Force Awakens, Cowboys vs Aliens, X-Men: Days of Future Past, Terminator Genisys, Pacific Rim, Paul, Men in Black 3
We will use this 1950 movie (Destination Moon) as an example for initial analysis, thinking about issues such as representation of gender, business/government, enemy/threat/'the other', mise-en-scene...
This is a better known 'classic':
This one you may have read!
Hybridity isn't a new idea...
A good example of how postmodern irony has become common - and how some movies do target an older primary target audience!
A good example of hybridity:
SOME DOCS ON SCI-FI
71 SCI-FI DOCS
By another YouTuber ('User')
50s/60s + some older sci-fi...
Recent sci-fi film trailers
In order: Avatar, The Force Awakens, Cowboys vs Aliens, X-Men: Days of Future Past, Terminator Genisys, Pacific Rim, Paul, Men in Black 3