EW.com is reporting that two new characters will be joining the fifth season of Lost - and they may become series regulars in season 6.

EW.com reports that the two new cast members will play characters who are “as mysterious as they are lethal.”

Who? What? Huh? Okay, it’s a long haul until the start of Lost’s fifth season, but production will begin this month, so that’s at least a little encouraging.

EW’s rundown on Caesar and Ilanna:

“First up is Caesar, a dangerous, physical and extremely intelligent male between the ages of 35 and 45. Although his intentions are unclear, this much is certain: He’s as skillful at charming people as he is at killing them. He also has a dark past, but, c’mon, that much was a given.

The other newbie is Ilanna, a European female in her late 20s to early 30s who possesses great intelligence, but who’s also dangerous as all get out. She’s alluring and apparently used to getting her own way.”

No word yet on who will play the new Lost characters.