Worf, son of Mogh, had a rough start in this world. He became a young orphan when his Klingon parents died during a Romulan attack. He was adopted and raised by humans, though his brother was raised by Klingons.
While he is dedicated to the crew, his Klingon beliefs often put him at odds with Starfleet policy. Well-suited for his tactical-and-security position, Worf is the consummate warrior. He's respected and, oddly, loved for uttering things like "It is a good day to die." In one episode, he suffers a spinal injury and undergoes high-risk surgery because he'd rather perish than be paralyzed for the rest of his life.
But tough-guy Worf has a softer side too. He has an affair with a Klingon-human woman named K'Ehleyr, which results in a son, Alexander Rozhenko. K'Ehleyr is murdered, sending Worf for revenge.
When it comes to romance, Worf tries to steer clear of pure-blood humans. He tells Commander William Riker that non-Klingon females are too fragile. Worf does end up fishing off the Starfleet pier, though, and strikes up of relationship with counselor Troi.
Born on Dec. 9, 1952 in Luling, Texas, the 6-foot, 4-inch Michael Dorn is comfortable in both imaginary spacecraft and real aircraft. Dorn has flown with the Blue Angels and the USAF Precision Flight team. He owns several planes, including an Air Force T-33 trainer jet.
His character, Worf, has plenty of staying power: Dorn appeared in Star Trek: The Next Generation and Star Trek: Deep Space Nine for 12 consecutive years. He's acted in more than 280 Star Trek episodes and films.