I wasn't expecting much from this when it came on TV and was half-watching while doing computer stuff but it pretty soon drew me in. The characters and their interactions were much more realistic than I expected and the acting was really good. Last night I watched World War Z a big budget 'zombie' film from 2013 starring Brad Pitt and it was really poor - Impulse is a far more mature and involving treatment of a broadly similar theme.
Review of Impulse
