Walden grants Alan a wish as a divorce present. Lyndsey does not approve of Alan's choice so he tries to make it up to her.
Lyndsey drops off some off Alans old things and tell him she is leaving town. Alan tries to win her back and breaks up with Ms. McMartin.
Walden joins a support group for fathers with adoptive kids. But Alan isn't that easy to get away from.
Walden and Alan become foster parents for the weekend to a 6 year old boy named Luis. Walden is frustrated over making this work; thus, triggering series of fun incidents.
Walden baby proofs the house to pass the inspection from the adoption agency. Walden and Alan have a "we're getting a baby party" with their friends.
Walden gets a new toy, but soon finds his future at Nicole's startup may be limited. Meanwhile, Alan can't stay away from Lyndsey and Larry and begins dating Larry's sister.
Alan proposes to Lyndsey but ends up engaged to Judith. Meanwhile Jenny is afraid Brooke is breaking up with her.
Alan is upset when he discovers that Lyndsey broke up with Larry and kept this information from him. When Walden’s masculinity is questioned he decides to prove he is a real man.
Walden and Alan throw a bachelor party for Marty once he proposes to Evelyn.
Walden is feeling frustrated because Nicole has no time for him due to a software project, so he offers to help her with it. Larry convinces Alan to go on a blind date, which Larry arranges.moreless
Alan gives Jenny relationship advice and Walden enters into a new project with a former employee.
Jenny needs Walden’s help in getting a second date and Alan finds trouble with his girlfriend’s ex-wife.
Walden ends up on a date with a clumsy woman which extends his time with her. Alan finds himself involved with a woman who shares too much information with him.
Walden finds himself in danger and must turn to Rose for help as a result if the affair between Alan and Lindsey.
Walden and Alan plan a double date with two attractive women, but Lyndsey gets jealous and ruins the evening.
Alan persuades Walden into inviting Lynda Carter over to dinner.