I'm pretty sure the Black Jack one is in the 1980's anime. The story involves recruiting Astro and Black Jack from the "future" and "present" respectively, and travelling to the "past" to help Sapphire (aka Princess Knight) regain (retain?) her/his throne.
It's a little surreal as an Astro Boy episode, but I remember cackling the entire way through when I watched it last year during my 1980's Astro Boy DVD set viewing.