Hawaii Five-0 will undergo a few changes on Season 4.

First, the show will move to Fridays and premiere on September 27.

Second, it will welcome a few special guest stars, beginning on the opener with Chi McBride, who will resurrect a character made famous on the original 1970s incantation of the series: SWAT Captain Lou Grover. Get your first look at the veteran actor in this role via the following premiere pictures. Click to enlarge:

CBS has also released the official synopsis for the Hawaii Five-0 Season 4 premiere.

It will feature Henry Ian Cusick as a member of a terrorist organization, along with danger for Catherine. Consider yourself spoiler warned and read through it now:

After McGarrett and Wo Fat narrowly escape from maximum security, gunmen storm Five-0 headquarters, compromising Kono and Adam's secret location in Hong Kong and forcing McGarrett to break the law and turn on his own in order to find a kidnapped Catherine.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.