Hi :) Okay, I'm looking for a TV show about space travel, probably situated in the 70's. The characters have weird carvings in their forehead. Thanks in advance!

I'm not sure if this helps, but the only shows I can think of that might vaguely give that impression are some of the assorted Star Trek series or Stargate SG1. In the Star Trek series, it's possible that maybe the Klingons could have looked like that to you. They were darker skinned and had deep ridges in their foreheads. And on Stargate SG1, some of the alien races had emblems on their foreheads. I suspect it might be the Klingons you're thinking of though.