Cartoonist Alex Dempsey's Adventure Time and Space! imagines Doctors 9-12 and their assorted companions as visitors of Adventure Time's Land of Ooo, with fantastic results. The fun will never end! Anywhere!
"I've always loved crossovers where there's a link between the two pieces of media," Dempsey tells io9. "I find it justifies the crossover and gives them a reason to be thrown together. In [the case of Adventure Time and Space!], it was the link between the term 'An Adventure in Time and Space' and the Title 'Adventure Time' and putting the two shows together seemed to work perfectly."
Another of Dempsey's AT/DW-themed series, The Doctor Dances, is equally heartwarming: