Sheldon gets his dream summer job at the local train museum. Also, George and Missy bond when Missy embarks on a new stage of womanhood, and Georgie discovers Mary’s guilty pleasure.
The FBI's assistant director of national security, Linda Barnes (Kim Rhodes), joins the BAU as they investigate a quadruple homicide of a group of roommates in St. Louis.
Christy is certain that Bonnie is in over her head when she invites a freshly paroled Tammy (returning guest star KRISTEN JOHNSTON) to stay with them.
After Tim has a heart attack, he becomes super clingy and annoys the entire family. Also, Greg and Jen make a pact to keep their baby’s gender a secret; Sophia’s new pet frog turns out to be a dangerous species; and Matt and Colleen receive news about their impending adoption.
The season two premiere picks up during the Big 3's 37th birthdays as Randall and Beth debate a big life change, Kate takes the first step in pursuing a new passion and Kevin balances the demands of his career and relationship. Meanwhile, Jack and Rebecca deal with the fallout of their big fight.
