"The universe has to move forward. Pain and loss, they define us as much as happiness or love. Whether it's a world, or a relationship...everything has its time. And everything ends."

That's from School Reunion. I actually squee'd when Sarah Jane first showed up on screen in that episode. I mean, I knew Sladen was one of the two featured guest stars in it, and I was excitedly looking forward to seeing it, but when Sarah Jane showed up on the screen it took me straight back to the days when Classic Who was new and the character was so much FUN to watch.

All the female New Who companions have been galactically awesome, but Sarah Jane is still the finest of them all.