SXSW film festival: Sadie Sink, Kelvin Harrison Jr and Regina Hall are left adrift in messy attempt to mash genres

Sadie Sink needs to be freed from whatever nostalgia curse has condemned her to a career full of pop synth soundtracks.

If Sink seemed the obvious choice to lead O’Dessa – a dystopian rock opera that feels like an 80s retro futurist screensaver lurching to life – it’s because of her impact in Fear Street: Part 2 and Stranger Things. Both situate the seemingly wise-beyond-her years star in the reimagined past of 40 to 50 years ago.