The story of the first humans on Mars appeared shortly after Pathfinders in Space took our heroes to the Moon. This series is a vast improvement on the first serial, largely by giving us a villain, in the shape of George Coulouris, probably wondering how he had progressed from Citizen Kane to this.
This follow up to Pathfinders in Space appeared only a few weeks later. Although it was recorded in a similar way at nearly the same time, the image quality on the DVD is noticeably better (although Episode 2 suffers from some broadcast problems).
Returning to this after a lapse of fifty years, I was pleasantly surprised by how well it has stood the test of time.My only major problem was how a ship designed for a lunar voyage came to have the supplies needed for the vastly longer trip to Mars.