Answer: the characters interacted with an animated dinosaur
Explanation:
Winsor McCay released an animated multimedia film in 1914 known as Gertie the Dinosaur and in it the characters such as Winsor McCay himself and a few of his friends, could interact with Gertie as she walked out of her cave and ate a tree and listened to commands from Winsor.
It was first multimedia film as it included both live characters and animation and heralded a new age to come.
