The premise is a bunch of late teens/young-twenty-somethings who are drafted into community service for having been charged with misdemeanors (public fighting, drunk driving, theft of bowling-ally-candies, etc) and are out picking up litter (or some such) when a storm comes along and strikes them all with lightening, granting them powers.
Not exactly superheroes, these characters are constantly on the defense of the world going to sh**. As random dangers show themselves, the young people become very dangerous to their probation workers, who, on the periphery consistently end up exposed to the chaos that seems to follow our main characters. And like all paranormal sorts of stories, where these abilities defy the natural order of the universe, the magical other worldliness is never good for the normals.
On a side note: I love the show, but need to acknowledge that one of the actresses was arrested for racially aggravated assault against an individual (who, judging by the name) is likely of Middle Eastern Descent. I do not approve of this and my support of the show is in no way a support of this behavior.
Lauren Socha, the actress in question, plays Kelly and is the sister to Michael Socha, who plays Tom in the original British version of Being Human.