The dashing hero was Mike Donovan, played by a tall, gruff-voiced 80's action hero. He threw giant haymakers, shot pistols by laying them across his left forearm and point shooting, and shot rifles without using the sights . . . and his acting style was a cross between Captain Kirk and MacGuyver. But that's not the nerdiest part.
I thought to myself, "Hey . . . he looks a lot like the captain in the brown leather coat from Out of Gas . . . I always wondered if I'd seen that guy somewhere before . . . . but no, they're about the same age. No way that guy stayed that young that long. So I went through the credits and found that the actor's name was Marc Singer. And even that is not the nerdiest part.
The nerdiest part was when I thought about it for a couple of minutes and then it hit me--Oh yeah! Marc Singer! He played the immortal who went crazy out in the mountains and kidnapped Tessa in that Highlander episode! Remember that guy? The one with the crazy raspy voice and the battle-ax?
If you said yes, you're a huge nerd, too. If you had to Google at any step, there's hope for you. Walk away now. It's too late for the rest of us.
UPDATE: Maybe there's hope for me yet . . . I had no idea Marc Singer was The Beastmaster until I Googled for images (by the way, I don't steal images--all the photos that come from the web are links back to the pages from which they came.)