[SuperScrounge]

Jrasmark, Bella never appeared or was named in an episode, just the title sequence. Weird. Then again, I don't remember seeing the Flintstone's saber-toothed cat in an episode outside of the end credits. How many other credit sequences have things that never appeared in the show? (Jonny Quest's African natives attacking.)

Western's Space Family Robinson Lost In Space had Tim and Tam who were fraternal twins (since they were opposite sex).

[Andrew999]

Don't want to be picky but I think the sabre-tooth cat belonged to Barney and Betty.

I was always a big, big fan of Jonny Quest - used to rush home from school to watch it - for the sixties, it was very grown up and sophisticated for a cartoon.

How could I forget the Phantom when it comes to father-son heroic partnerships?

[Andrew999]

They most certainly did - and greatly underused as characters if I may say so:

https://en.wikipedia.org/wiki/The_Bash_Street_Kids#Other_characters

Wilfrid was also an enigma - as a child, I always suspected him of being a secret evil mastermind . Of course, there was never any evidence of that but then a true genius would always be sure to cover his tracks - so that only confirmed my theory

[mopee167]

An imaginary story in which Superman has twin sons appeared in Superman #166 (January 1964). Jor-El II has super-powers, while Kal-El II does not.