The Vampire Diaires will flashback to 1864 one more time before this season concludes.

This development will take place on February 17, as Elena finds an old stash of John Gilbert journals. From there, viewers will be taken back to Stefan's darkest days, after he murdered his father and turned his brother.

"His guilt us so deep that he goes off the deep end," Paul Wesley says in the latest issue of Entertainment Weekly of his character's reaction to those events. "We find out that he would have been Damon had it not been for one character."

Who is that character?!? Wesley would not say. But our Vampire Diaries forum is open to your best guesses!