He has traveled to every city, every town and every outpost in the United States, Mexico and Canada, and has found no one. As he returns to his hometown of Tucson, Phil comes to the realization that he is almost certainly the last living being on the face of the earth.
Phil is outcast after everyone finds out about him telling the new women his wife is dead and they are alone and trying to get up to some hanky panky. Carol has an issue with the new women for trying to steal her man, and there is unrest in the small community. Phil realizes he is a liar.
After being locked up for her own safety, Melissa plays hurtful mind games with the group. Meanwhile, Todd and the group explore medications that might help her, and Lewis goes on a new solo adventure.
The gang moves into an old mansion; Carol forces Tandy to put down his new toys so they can baby-proof the giant estate; Melissa worries about Todd's health; Gail and Erica can't figure out why Dawn won't stop crying.
Todd asks Tandy for parenting advice when he notices that Jasper is acting more reckless than usual. Meanwhile, Carol and Erica realize that Jasper may be the only potential suitor for their babies and begin vying for his attention.
A thermal heat detector reveals a potential sign of life outside of the Zihuatanejo village, but Tandy doesn't want the group to split up to go investigate. Meanwhile, Todd and Erica have trouble seeing eye-to-eye.
The gang ventures out in search of what they think could be a new sign of life, but are surprised at what they actually find. Meanwhile, Todd makes a few morbid discoveries of his own back at the mansion.