Origins (KEL DA 010-B) is a comic published in 2012 on DeviantArt by Kelly Green.
The Hitchhiking Ghosts meet their younger (albeit still ghostly) selves.
”Just a random diddy before I go out on a 4-day trip. Based around this piece by Marc Davis.
I tried (note: tried) to mimic it a bit, but as you can tell, I got lazy by the time it came to do something with the background.
I just want to add that I actually like Marc's design for Phineas more than the final result. Phineas as he appears in the ride just always seemed sorta bland to me (hence why I always draw him with the cloak anyway). Buuuuuuuut that's just me.“