The Slap The Slap

A split-second action has consequences that change a family forever in NBC's upcoming miniseries The Slap.

Based on an Australian show of the same name, the eight-episode series begins at a 40th birthday celebration for Hector (Peter Sarsgaard) that erupts into chaos after Hector's cousin Harry (Zachary Quinto) slaps another couple's misbehaving child.

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"One single act can have this ripple effect upon everyone else's lives in all these unexpected ways," co-star Uma Thurman says in a first-look promo, exclusive to TVGuide.com.

As the ensuing drama plays out in the courtroom and beyond, family secrets come to light and long-held beliefs are challenged.

Get a first look at the series here:

The Slap premieres Thursday, Feb. 12 at 8/7c on NBC.