Plot summary
Monica is now spending more time with her family, often getting Debbie and Carl to stay up late at night to watch movies with her and Frank. Ian continues to get harassed by Terry, who believes he got Mandy pregnant. Per Monica's suggestion, Ian tries to enlist in the Marines, but is turned down as he lacks a high school diploma.
With Monica around to help out, Fiona begins to focus on her future by taking GED classes and taking initiatives to move up in her club job; her boss, Meg, hesitantly agrees to let Fiona manage a club night. Steve attempts to smuggle Marco into the United States to reunite Estefania with her true love and get back into Fiona's good graces, but complications arise when they can't find him. Estefania later gets mad at Steve when he realizes Marco is running out of resources and calls him a "dead man" before leaving their room.
Sheila and Jody take in Ruben, a deaf drug addict, into their new "hospice". Sheila struggles to communicate with Ruben, until Jody reveals he knows American Sign Language and can finally see what he needs. Kevin and Veronica have been unsuccessful in their attempts to make a baby, prompting Veronica to visit a fertility clinic; she later discovers that she is highly unlikely to get pregnant because of PID.
Monica finds the family's "Squirrel Fund" and decides to get her and Frank a few gifts, including drugs and a new car. After Terry once again tries to shoot Ian in his house, Mandy pulls up a shotgun on her father to let Ian live. Lip and Ian realize that Terry actually got Mandy pregnant while drunk, and he was trying to express his guilt by framing Ian. To help with an abortion, Ian starts a fundraiser with his family. Monica takes Carl on a ride, and allows him to drive the car, which leads to their arrest.
Lip arrives at the house to get bail money but realizes Monica took the fund; he is forced to use his own money to bail them out. Before Fiona leaves for her night at the club, Lip informs Fiona about the event and harshly reprimands her for not focusing on her family. Stunned, Fiona says she thought it would be different this time. After tearfully scolding Monica for her actions, Fiona returns to the living room, where she breaks down before cleaning up the kitchen.
Credits
Adapted from Wikipedia contributors, A Great Cause. Paragraphs and formatting adjusted; illustrations, reference markers, block quotations and non-story material omitted.