Walden and Alan throw a bachelor party for Marty once he proposes to Evelyn.
Jenny moves into Evelyn’s home because of Walden’s feelings. Alan hooks up with Lyndsey even though she is seeing another man.
Charlie’s illegitimate daughter suddenly appears and Alan is surprised not only by her existence but by how much she is resembles Charlie.
Walden rushes to plan a surprise birthday party for Zoey.
Having graduated high school, Jake and Eldridge face new urgency to face their adult lives.
Zoey suspectsAlan doesn't really deserve all the love and attention he's getting following his release from the hospital.
After suffering a minor heart attack, Alan is visited by Charlie's ghost while in the hospital.
Walden knows Zoey won't be thrilled to learn Bridget is a partner in his new venture with Billy. Meanwhile, Alan and Lyndsey try to cope with their mothers dating each other and deal with Eldridge and Jake's questions.moreless
When Lyndsey's mother comes for a visit, Alan suggests she meets Evelyn. Walden is stuck hearing out iPhone app ideas from Jake and Eldridge.
Alan faces a number of shocking events after being released from the mental hospital.
Walden has Alan come along for the ride when he tries to get his ex-wife, Bridget, to take him back.
Following Charlie's funeral, Alan meets Internet entrepreneur Walden Schmidt.