The summer starts off with a bang when Carl takes his friendship with Lindsay to the next level; while the returning housemates savor the juicy gossip, newbies Luke and Jules wonder what they've signed up for.
With house parents Kyle and Amanda away at a family wedding, the "kids" are ready to run wild; Lindsay's friend, Danielle, joins the party; Luke pulls out all the stops to court Hannah even though she's looking for a commitment from another guy.
As the house gears up for its Fourth of July party, Jules wants to be friends with Paige, while Luke wants to be intimate with Hannah; Carl and Lindsay's first date is a full-blown disaster; Amanda slams the door in Kyle's face, setting him off.
The yearly Fourth of July bash is usually a high point for Kyle and his trusty mullet wig, but things are so rocky with Amanda that the only love he may get is from Carl; Lindsay gives Hannah's friend Armand the third degree.
Hannah invites her old buddy Jordan for the weekend and the housemates are surprised to learn that he has a romantic history with somebody in the house; when Hannah gets news about Armand, it helps her make a decision about Luke.
As Lindsay and Carl try to fix what's left of their friendship, Luke and Hannah's continuous flirtation leads to their first date going to new heights; it's a house divided for girls' and guys' night.
Kyle surprises Amanda with a shocking answer to a simple question; Luke revs up his courtship of Hannah with a motorcycle ride as Jules tries to break through a sexual roadblock; Carl and Lindsay try to move forward with new flings of their own.
Kyle and Amanda's mothers visit for the weekend; and the boys of "Summer House" behave badly; Jordan stuns Jules; Luke shocks the house with his relationship status; Carl still can't make things right with Lindsay.
Kyle and Amanda turn the house into a petting zoo for Kyle's birthday; Paige laments that friend Hannah has fallen under Luke's spell; Carl invites his new fling to the house; a spat between Jules and Jordan escalates into a possible eviction.
As Kyle's birthday party comes to an end, Jules wonders if her time at the house is coming to a screeching halt; with Hannah distracted by Luke, Paige and Amanda don't hesitate to throw her under the bus.
Lindsay turns the house into a crime scene for her murder mystery-themed birthday; Paige is put in an uncomfortable position as tension between Hannah and Amanda escalates over Hannah's involvement with Luke, who is still hung up on an ex.