Anna and Diana square off in the dark bowels of the Mothership - Diana has been down there for 15 years and not had a single glimpse of Anna. Meanwhile, Erica has Tyler's blood analyzed, and learns the V's did something sinister to her when she was pregnant with him.

Cast: Elizabeth Mitchell, Morris Chestnut, Joel Gretsch, Logan Huffman, Laura Vandervoort, Morena Baccarin, Scott Wolf, Charles Mesure, Roark Critchlow, Rekha Sharma, Jane Badler, Bret Harrison, Mark Hildreth, Christopher Shyer