In the US version of this show, the crew of Pegasus gave up at Saturn. This is the full version, where after Saturn the crew went on to visit Pluto and a comet before coming home.
This was broadcast two years before the IAU lost their marbles and voted Pluto out of the lineup of planets. This episode has the full Pluto segment, unaired in the States.
A transient glitch occurs between 38:47 and 38:56, where the footage skips back unexpectedly to a segment in the Saturn chapter.