Guess a Classic Horror/Sci-Fi by a Description

[Memphremagog]

The Twilight People (1972)

Right region, but again, not quite..

[horrorhunter]

Mad Doctor Of Blood Island (1969)

[Memphremagog]

Mad Doctor Of Blood Island (1969)

Bingo! Your turn!

[horrorhunter]

Dude tries to bring his dad to crash the big party, but inquisitive church people disapprove.

[Memphremagog]

The Omen?

[horrorhunter]

The Omen?

No, but it is a mainstream Horror film. I saw it at the theater back in the day.

[Memphremagog]

The Dunwich Horror?

[horrorhunter]

The Dunwich Horror?

Nope. It doesn't involve any Lovecraftian Horrors specifically, though the premise is akin to an H.P.L. theme.

[horrorhunter]

No, I'm not confused about which thread I'm posting in. This is a hint because I don't think anyone will guess my heavily encrypted description and we need to move on.

[Mike Scott]

Deja-Vu !

[horrorhunter]

Deja-Vu !

Your turn. 

[Memphremagog]

No, I'm not confused about which thread I'm posting in. This is a hint because I don't think anyone will guess my heavily encrypted description and we need to move on.

Wasnt it Prince Of Darkness?

[horrorhunter]

Wasnt it Prince Of Darkness?

Yep. Mike guessed it correctly when I similarly posted it as the pic in the other thread (Name The Monster Movie). His "Deja-Vu" comment was his nod that it was the same answer. It's his now to post or pass.

My description was masked in metaphor. It should be read as- Satan tries to free his father, the Anti-God, into the prime material plane (Earth), but scientific researchers based in the old church succeed in thwarting it (for now).

[Mike Scott]

A man sets his guard animals (whom he adores) free, just before going on a long journey with a couple of acquaintances (one who wasn't invited).

[Ludi]

First Men in the Moon