Echoes’ star Krysten Ritter on the sequel’s main character. The series debut of AMC and BBC America's "Vagrant Dark: Reverberations" offers only a couple of substantial things about Lucy, the baffling person played by Krysten Ritter. As a matter of some importance, she is normally creative, which proves to be useful when she awakens without any memory of what her identity is, with a sort however strange lady (Keeley Hawes) examining her about all that she knows.