Mary Magdalene and "the other Mary" head over to the tomb.
And as it turns out, sealing the tomb doesn't do much. An earthquake and angel can open that bad boy right back up again.
The guard becomes paralyzed with fear so he's basically rendered useless.
The two Marys are greeted by an angel who says that Jesus has already been raised and that they should go tell the other disciples.
Guess who they meet on their way to do just that? Why, none other than Jesus Raised-From-the-Dead Christ. Naturally they're ecstatic, and Jesus sends them off to tell the others in Galilee.
The guards tell the chief priests about what went down. It goes without saying that they are less than pleased.
The chief priests' new plan is to bribe the guards into claiming that Jesus's body was stolen in the night. And that's the story they start spreading around.
Resurrected Jesus gets to Galilee and meets up with the remaining eleven disciples. For his final instructions, Jesus tells his friends to "make disciples of all nations" (28:19-20). Oh, and he'll always be with them.