Invasion cinema

“Invasion Cinema could be certainly considered a rich subgenre of Science Fiction. it originated from:

1) Fear and anxiety about possible alien invasions (see the 1947 Roswell episode)
2) fear of ‘communist infiltration’ and other Cold War side-effects
3) crisis of Hollywood film (TV had become a fierce competitor in the 50ies. it was no longer possible to build big-budget fantastic sets. monsters coming to our door steps were much cheaper and easier to make [Wierzbicki])

some example of “Invasion Cinema”
http://blog.invasioncinema.com/

Examples of “classic” invasion cinema
“It came form outer space” (1953)

“attack of the giant leeches” (1956)

“the blob” (1958)

The last generation of Invasion Cinema: the Host, (Korea 2006)