Another of the great TV series of the 1960’s was Quinn Martin’s The Invaders, an hour long drama, that, as usual as per my favorite programs of 50+ years ago, lasted but two seasons. But what a two seasons they were! Nothing like this series had ever before been seen or even attempted on television and, like Star Trek TOS of the same time, it was canceled even though it was hugely popular. Go figure.
Source: Before The X-Files, there was – The Invaders – Neatorama