What is "tunnari" in English ? I know that it can be "signature music" but not in this case because here it is not only about music. Could it be "opening narration" or is there another word for it ?
The Finnish title for "The Invaders" was "Muukalaiset " ( The Strangers ). It sounds better than "Maahantunkeutujat" ( http://www.eudict.com/?lang=engfin&word=invader )
Here is an episode from 1967 called Panic ( "paniikki" in Finnish ):
http://www.youtube.com/watch?v=n_AtkIgC ... Lgd9dmJQNZ
So you can learn some Finnish by watching old episodes of "The Invaders" !

You just ask yourself "What would that word be in Finnish?" or "How would a Finn say a sentence like that?" and then you bring your question to this forum.

"The Invaders: alien beings from a dying planet. Their destination: the Earth. Their purpose: to make it their world. David Vincent has seen them. For him, it began one lost night on a lonely country road, looking for a shortcut that he never found. It began with a closed deserted diner, and a man too long without sleep to continue his journey. It began with the landing of a craft from another galaxy. Now, David Vincent knows that the Invaders are here, that they have taken human form. Somehow, he must convince a disbelieving world, that the nightmare has already begun..."