Quite right! With a few exceptions, Star Trek and other sci-fi shows were a North American phenomenon until much later.
Canada has always been an exception as US television arrived in our major cities via border stations almost as soon as it did in the US. By the mid 60s, most everyone in urban Canada had cable with all the US networks. In many apartment buildings, cable access was included in the rent.
Canadian networks licensing from the US had to get ahead of their US counterparts. That’s why Star Trek premiered in Canada on September 6, 1966 on CTV - two days ahead of its US premiere on NBC.



