I watched this TV series in my youth during the '80s, but the series could be from earlier.
I think that it was a dystopic present/future.
The only part that I remember is the end of the opening.
A line of soldiers (or guards) wearing a dark uniform and with their weapons (a type of rifles) in a two-Handed or “Ready” Carry position started going down a set of stairs towards the camera.
Behind the soldiers appeared a man with a grey or dark hooded tunic. He is wearing the hood and I think that you can see his face very well. He carries a dagger in each hand. Then he raised the daggers crossing them and forming the symbol of the series.
Be aware that I could be wrong in some details, but I am pretty sure to remember it if I watch the opening.
It was broadcasted in ETB1 (https://en.wikipedia.org/wiki/ETB_1) and dubbed in Basque.
I think that it was in color.
There was a resistence or something similar.
I remember two characters (boy and girl) running and explosions. But I am not sure if that was in the Intro or during an episode.