I loved Prince Planet!
I know that was big in Australia too, as I was reading about it. I have on tape the Japanese version of it too (terrible copy but interesting). When I was a kid they would play every episode in chronological order. But I ALWAYS missed the very first one and the very last one until I got some tapes off EBAY. Man did that bring back memories. I also loved, as a kid, Marine Boy, which had an interesting quality.
Felix the Cat, the 1958 version of it. There is a surreal, space age 50s, suburban mid century modern undercurrent to this series that is just unbelievable. I mean, geez, the production company was "TRANS-LUX"!!!!! How about the very beginning of the theme song with that xylophone (or whatever it is). Master Cylinder. The Professor. Poindexter. The look and sound of it which was similar to the look and sound of some of the late 50s drive-in cartoons (in a way). Note: Not to be confused with that abomination "Felix the Cat's Twisted Tails" that came out in the 90s, which was some sort of perverted, disgusting take on the whole thing. Don't say I didn't warn you if you come across one of these.
Atom Ant, the Jetsons. The Flintstones was among the first TV images I remember (along with Winchell, The Patty Duke Show and I Love Lucy, reruns of course). We had for the longest time the original Welch's Flintstones grape jelly jars that were glasses after the jelly was finished.
Not to forget Astroboy!!!