We know about Claude, The invisible Man, is joining to crew. But except Claude, we may have a new female hero too. Guys from SpoilerFix thinks that, this new hero might be played by Jessalyn Gilsig, who is formerly played Gina Russo in Nip/Tuck

New character alert! A new female hero is joining the cast for a mini arc, and this person’s power is unlike anything we’ve seen on the show so far. All I’ll say is, she’d come in very handy on Survivor. - Ask Ausiello

[spoiler]She will be playing Claire’s biological mother, and I also hear that she will have a power of her own. (via Kristin & via Rob)[/spoiler]