Just FYI, if you call yourself a fan of small screen science-fiction and really have no idea what Dean Stockwell has been up to since "Quantum Leap" went off the air, you might want to check your cred, because he played a key role in one of the most beloved sci-fi series of all time. That series was, of course, Ronald D. Moore's near-flawless '00s revival of the iconic, late-'70s sci-fi fantasia "Battlestar Galactica."

Moore's "Battlestar Galactica" revival was originally conceived as a two-part miniseries event, which aired on The Sci-Fi Channel in 2003. So well-received was that two part event, the network quickly gave "Battlestar Galactica" a full series order. The series premiered the following year, and went on to run for four up-and-down seasons between 2004 and 2009. Dean Stockwell didn't join the cast of "Battlestar Galactica" until late in the series' second season but, when he did, the actor made an immediate, and lasting impression as the less than traditional religious counselor, John Cavil.

It would later be revealed, of course, that Stockwell's character was actually a Cylon infiltrator capable of truly Machiavellian manipulations. Stockwell would go on to portray two different version of the infamous "skin-job" we'd come to recognize as Number 1. In true Number 1 fashion, each of those characters were possessed of a wickedly sardonic view of the world, not to mention a particularly sadistic mean streak that was all but unrivaled by any other character on the series. Though Dean Stockwell's run on "Battlestar Galactica" lasted but 14 episodes, his character arc remains one of the most memorable.