Doctor Who: my kind of ending. Yes, I’ve been rewatching it again.
Donna keeps her memories and her human/time lord hybrid nature because [insert sci-fi explanation], finds the sonic pen from the episode Partners In Crime and travels with Doctor and Rose, and Martha and Mickey join them sometimes when they want a break from working from constantly defending Earth AND ALL OF THEM ARE IN ONE UNIVERSE THANK YOU VERY MUCH. And Jack too, he just didn’t fit in the composition, sorry Jack.