West Hollywood talent agent Nathan Adler recalls how he first met 80's rocker Brad King, personal trainer Al "Muscles" Carter & actor Ross Stein as he begrudgingly prepares for his 50th birthday party.

Living vicariously though his friends' adventures leaves Nathan feeling empty; Ross confesses his recent marital woes; Brad's latest conquest bruises his self-esteem; Muscles has too much in common with Bobby.

Brad gets revenge on his latest hook-up; Ross receives some provocative marriage advice; Muscles tries to get Bobby to discuss their dilemma; a cryptic session with his shrink leads Nathan to a mind-blowing encounter.

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.

Lydia debuts her cabaret act; Brad makes a radical lifestyle change; Nathan meets a man from Damian's past, then makes a call to Christoph; Ross tries something new to save his marriage; Muscles is frustrated.

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 confers with a divorce lawyer; Muscles is attracted to a gym patron; Brad's accountant delivers bad news; still reeling from Damian's disappearance, Nathan has a life-changing accident.

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 is haunted by his past as the gang gathers for Thanksgiving; Lydia introduces her new boyfriend; an unwelcome guest interrupts dinner; Brad attempts a new career path.

At Jake's urging, Nathan quits smoking; Brad tries retail but old habits die hard; Muscles questions Lucas with his new suspicions; Ross receives an unsettling welcome home; tensions rise between Lydia and Barbara.

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.

On Christmas Eve, disillusioned Muscles heads home to Ohio; Damian's holiday card and no reply from Jake sends Nathan spiraling with indecision; Brad hits rock bottom; Ross, now a tabloid sensation, succumbs to Dan's advances.

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!