By Jessica Michele Herring ( | First Posted: Aug 28, 2013 04:58 PM EDT

Mae Whitman as Amber Holt, Matt Lauria as Ryan York (Photo : Vivian Zink/NBC)

Season five of NBC comedy-drama "Parenthood" will feature some road blocks that could impede two character's impending nuptials. 

Amber (Mae Whitman) and her on-again, off-again boyfriend Ryan (Matt Lauria) may finally be tying the knot. However, TV Guide reports that a number of situations will arise that may throw their marriage plans off track.

One problem that arises is when Sarah (Lauren Graham) reveals how she really feels about the marriage. Sarah will also hire Ryan to work as plumber in the apartment building where she is the superintendent. To add to the drama, Kristina's (Monica Potter) opponent in the mayoral race turns out to be Bob Little (Jonathan Tucker), Amber's fling from the third season. 

As for Kristina's political battle, Entertainment Weekly reports that she will call on her experience as a mother to help gain attention, and therefore supporters. She will specifically call upon her experience dealing with the often exasperating school system to boost her political appeal. 

Amber may also face some other distractions that could detract from her wedding plans. All-American Rejects lead singer Tyson Ritter has been cast in the recurring role of Oliver Rome for the upcoming season. Rome is described as "the immature, egomaniacal, tantrum-prone lead singer of a hot new rock band that is recording at the Luncheonette."

TVLine also reports that Matthew Atkinson of "Jane by Design" will be joining the show for multiple episodes. Atkinson will play Zach, the drummer in Rome's band. Atkinson's character will begin a friendship with Amber. 

It was also reported that Adam (Peter Krause) and Kristina's oldest daughter Haddie (Sarah Ramos) may make a guest appearance in the upcoming season. TVLine reports that although there are no confirmed plans for Ramos to appear, she might make one or two appearances during the season. Ramos may appear during Amber and Ryan's wedding if they do end up getting hitched. 

"Parenthood" returns on Thursday, September 26 at 10 p.m. on NBC.

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