Orphan Black has one of the best pilot episodes I've ever seen. Worth checking out for that first episode alone. It sets up the mystery incredibly well and asks a really cool, fun question.

Throughout the series you'd probably recognize actors from other stuff, too. Kinda fun when they appear.

PG13 horror: The Changeling (1980).

I'm thinking you want horror short stories as well?

Never Whistle at Night: An Indigenous Dark Fiction Anthology

Wounds: Six Stories from the Border of Hell by Nathan Ballingrud

Horror shorts for seniors: John Langan and Brian Evenson have great collections.

The only one I can think of that matches that description is PLAN B.

I've only seen the first season starring Patrick J. Adams but it was pretty good. Worth watching.

ALPHA by Julia Ducournau is coming out later this year.

The Shadow Strays

It delivered what it promised.

I did find the english speaking moments clunky but once they switch back to the main language it was much smoother.

Was it too long? Probably. But it was still epic and entertaining and worth watching if you enjoy violent action movies.