The two Dr. Who films made in the 60's were complete re-imaginings of early William Hartnell (1st Doctor) serials. In the films, the character of 'Dr. Who' is a human scientist who invents a time machine (that just so happens to look like a Police Box). Both adventures featured his granddaughter Susan, just like in the original TV program, but for these films the TV companions Barbara and Ian were made into Dr. Who's OTHER granddaughter and her boyfriend.
Nothing in those films has become cannon to the television series as everything in them is rehashed and/or bastardized from the series. They are very enjoyable productions though, and I highly recommend them. Especially if you like the idea of Gran Moff Tarkin playing the Doctor.