Ready to go back to 1864, Vampire Diaries viewers?

The show will flash back to the 19th century one more time this season, as the April 29 episode focuses on a major mystery: How and when did Stefan and Damon become vampires?

In the former's dazed state, below, he recounts life back in the day. This is a clip from "Blood Brothers."

[video url="http://www.tvfanatic.com/videos/stefan-flashes-back/" title="Stefan Flashes Back"] [/video]

As for other Vampire Diaries spoilers, the original John Gilbert's invention will play a key role over the next few weeks, leading to an explosive finale in May.

Damon inspects it in the following sneak peek, wondering what's so unique about this small, seemingly harmless chunk of metal.

[video url="http://www.tvfanatic.com/videos/blood-brothers-clip/" title="Blood Brothers Clip"] [/video]

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.