After a run-in with a professional rival, not even gifts, cocktails and the boys' valiant efforts can cheer up Nathan on his 50th birthday; Ross receives professional bad news; Brad regales the boys with stories of his sexual conquests of the past 24 hours.

An encounter with a long-forgotten one-night-stand has Nathan feeling his age; Muscles meets a potential Mr. Right; Ross' cheerful façade cracks.

Ross' ultimatum to Neal backfires; Brad gives Muscles tips for tops; Nelson Van Eddy returns to torment the boys; Nathan spends a secret afternoon with Damian.

A young fan tests Ross' resolve; Brad's doctor delivers shocking news; Muscles makes a last-ditch effort to save his relationship with Bobby; a day with Damian has Nathan feeling his age.

The mood is anything but festive as the gang gathers for the wedding of one of their own to notorious former circuit boy Dirk Evans.

Lydia sings at Dirk & Nelson's wedding reception, while Nathan meets photographer Christoph, Muscles makes a declaration to Bobby, Ross is overwhelmed by the romance, and Brad shares bodily fluids with one of the grooms.

The boys discuss weekend plans over brunch; Muscles & Bobby plan a romantic weekend; Ross decides to try an internet hook-up; Nathan makes a date with Damian then comes to blows with Nelson Van Eddy.

Two months have passed and it's Halloween in West Hollywood. Brad's vow of celibacy leads to a "message from God;" Muscles learns why Bobby went cold; Ross & Neal have a scary encounter; and Nathan convinces the boys to go undercover to help him stalk Damian. (Originally aired between seasons 2 and 3.)

Ross receives good news for a change; Muscles asks Brad for dating advice; Nathan gets a bizarre proposition from Nelson, then spends an evening with Jake; Brad parts with a piece of his past.

Nathan calls in PR specialist Dan Karmel when Ross' sex tape goes viral; Brad makes another attempt at gainful employment; Muscles meets Lucas' boyfriend; Lydia and Barbara have it out.

Muscles confides in his mom in Ohio; tough love from a counselor leads Nathan to "man up" to Jake before butting heads with Nelson; Ross is forced to make a choice; Brad receives a last-minute rescue.

The Old Dogs & New Tricks celebrate the Supreme Court marriage-equality ruling. On the morning of Friday, June 26, 2015, the boys are surprised by President Obama's announcement of the ruling – but the surprises are just beginning!