 Walter ( John Noble ) remembers that one of his former patients Rebecca Kibner ( Theresa Russell ) , while under a heavy dose of mind @-@ altering drugs , had witnessed events in the parallel universe including the presence of the shapeshifters . To try to learn more , they approach Rebecca and ask for her help , who is happy to participate . After outfitting her with electrodes and injecting her with more drugs , Walter starts the process by clanging a bell ; to everyone 's surprise , this causes Olivia to pass out . 
