<P> On the way they see strange lights in the road, run into them, and black out . They wake up in a hospital with no memory of who they are, and as they investigate, they discover that Quahog is completely deserted except for them . Walking on, they chance upon Peter's wrecked car by the roadside . They work out that it is indeed his car and discover his address . They also assume that they are the last people on Earth . </P> <P> When they find Spooner Street, Brian realizes that they live there, but they make wrong assumptions such as that Joe is a stripper and Brian is Quagmire's dog . At Peter's house the other three see the fake newspaper front page Peter bought after his laser - tag win; from this they suspect that Peter is an alien who has killed the rest of the world . Joe and Quagmire search for weapons while Brian spies on Peter, but by the time Joe and Quagmire return, Brian and Peter have bonded so that Brian warns Peter and they try to escape but the others intercept them . As Joe fires toward Peter, Brian jumps in front of Peter to sacrifice himself for him . Peter picks up and cries over Brian's dead body . </P> <P> Brian wakes up, startled and confused . It turns out Stewie had captured them and hooked them to a computer system simulating the world to see if Brian and Peter were just friends through circumstance, but the simulation has proved they do belong together . Then Brian notices that Stewie has attached Lois, Meg, and Bonnie to an identical system, but the women are fighting instead of investigating their circumstances, or even discovering each others names . </P> <P> In its original broadcast on March 18, 2012, "Forget - Me - Not" was watched by 5.61 million viewers and acquired a 2.8 / 7 rating in the 18--49 demographic, according to Nielsen ratings . Kevin McFarland of The A.V. Club gave the episode a C+, saying "I liked a lot of the throwaway lines and cutaway material packed around the central plot, but when Family Guy goes all in on one plotline without any other runners, it's a make - or - break choice . This question about Brian and Peter's owner / pet relationship didn't really need this sort of musing, as I'm still not sure this answer will make past episodes clearer, or influence their relationship going forward . It's just a statement because the show felt like it needed to make one now, and the dynamic of the show will change as needed, ultimately rendering this revelation and confirmation of Peter and Brian's friendship useless ." </P>

Family guy season 10 episode 17 full episode