We'd had this scene in a future lbt sequel:
Mr Threehorn: "Cera, join me in the dark side"
Cera: "Never! You killed my father!"
MT: "Cera, I AM your FATHER!"
C: "Noooooooooooo!"
What would happened if Littlefoot got in a DeLorean travelled back in time, and his mother fell in love with him instead of Bron?