How does the Ghost in Hamlet improved this play?

Question

There are said sources of Shakespeare's Hamlet like Saxo Grammaticus' work, Belleforest, etc. However there is no Ghost. How does the Ghost helped or improved Shakespeare's Hamlet? Please answer intelligently. Prove it. Thanks!

Answer 1

Hamlet is powerfully distraught about the death of his father.

For him to willy-knilly go off spinning his wild conspiracy theories, would be ridiculous were it not for the evidence offered by the ghost.

In fact, Hamlet reasonably demonstrates that his uncle killed his father, BUT, only due to the directives of the ghost. Therefore, the ghost not only improves...but MAKES the play by simultaneously being unbelievable and also by demarkating the evil deeds of Claudius.