Jenelle is back with Keiffer after bailing him out of jail. Leah feels isolated and decides to get a job. Chelsea struggles with whether to give Adam another chance. Kailyn and Jordan take Issac trick or treating.
Leah is devastated when she finds out Ali must be sedated for an MRI. Jenelle is living in her car with Keiffer. Chelsea gives Adam another chance but re-tears her ACL. Kailyn can't afford to live on her own.
Kailyn moves out without telling her mom. Jenelle files charges against Kieffer. Chelsea relies on Adam to take care of Aubree while she recovers from surgery. Corey and Leah get emotional during Ali's MRI.
Ali's MRI comes back negative to the relief of Leah. Jenelle juggles finding peace with her mom and dealing with Kieffer's domestic charges. Kailyn tries a new form of birth control. Chelsea fends for herself after surgery.
Kailyn adjusts to being alone for the holidays. Jenelle regrets filing charges against Kieffer. Leah works to make the holidays special for the twins. Chelsea and Adam make up but Randy bans Adam from the holiday celebration.
Ali may have a genetic disorder. Jenelle and Kieffer must face court for their breaking and entering charges. Chelsea finds out that her old friend is pregnant. Kailyn gets annoyed when she notices Jo's not around for Issac.
Kieffer is upset that Jenelle hung out with an old boyfriend. Leah is relieved that Ali has no major genetic disorder. Adam slips back into his old ways, much to the dismay of Chelsea. Kailyn considers filing for child support.
Jenelle moves in with her friend after fighting with Barb, and Kieffer reenters the picture. Chelsea's relationship with Adam is going downhilll. Ali may still have a genetic problem. Jo confronts Kailyn about child support.
Discovering that Jenelle is using drugs, Barbara tries to have her committed. Chelsea returns to beauty school. Kail and Javi get married before Javi is shipped off to Boot Camp. Leah's daughter goes through medical testings.
Kailyn's child support hearing is postponed and Jo meets Jordan for the first time. Jenelle is sentenced to probation. Chelsea struggles to get over Adam. Corey finds out that Leah cheated on him two weeks before their wedding.
Jenelle decides to go to rehab. Chelsea works toward her GED. Leah files for divorce in order to protect her custody rights. Jo visits Issac during the week and Kailyn hooks up with Jordan, even though she's still with Jo.
Jenelle recovers from her abortion and meets a new guy. Chelsea has her first day of Esthetician School. Kailyn and Jo fight about her move to Delaware. Leah goes on vacation but argues with Jeremy about his upcoming job.
Dr. Drew hosts the cast of Teen Mom on-stage in front of a live studio audience, where they reflect on the struggles of their early years of motherhood, the heartbreak, happiness and conflict we saw them face in season 2.
Dr. Drew examines Chelsea's relationship with Adam now that he has a new baby and wants more time with Aubrey. Jenelle discusses her abortion, her pregnancy, her criminal charges, and her turbulent relationship with Nathan.
