When quirky single mom Fiona and her son Marcus move in next door, Will's perfect world is changed forever.

Will attempts a much-needed boy's night out with Andy, but complications arise, leaving Will to reach out to Marcus in hopes of salvaging the evening. When Andy later becomes available, he attempts to track down Will, but instead winds up bonding over the joys of parenting with Fiona. Meanwhile, Andy and his reluctant wife Laurie solicit Will to be godfather to their son Jonah.