Following the most emotional episode in Lost history, this iconic series moves ahead with a new installment on Tuesday, May 11.

It will be unlike anything ever seen on the show before. In what way?

Don't expect a single series regular to make an appearance.

Instead, "Across the Sea," focuses on the two mysterious figures at the center of season six: Jacob and the Man in Black. As the clip below shows, we'll delve deeply into these characters' history on the island:

[video url="http://www.tvfanatic.com/videos/across-the-sea-clip/" title="Across the Sea Clip"] [/video]

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