Kim's boyfriend is released from rehab; Nicole and AJ get married; Shaniyah and Lemhele struggle with two new babies in the house; Lorna has a difficult birth.

Nicole makes a controversial announcement; Kim deals with her grandmother; Shaniyah gets induced.

Nicole has a c-section and Mariah refuses to help; Kim goes through a painful labor and delivery; Lemhele and Shaniyah go back to therapy.

Two families welcome a new child; two defiant boyfriends return while another slips away.

Tensions run high at Lorna and Chae's baby shower; Kim's boyfriend violates probation; Nicole is newly single; Lemhele races to the hospital to give birth.

Four mothers and four daughters who are all pregnant at the same time.

For four seasons fans of "Teen Mom" watched Maci, Amber and Catelynn face multiple challenges in their first years of motherhood, including such things as graduating from high school, relationships, getting jobs, beginning college and moving out on their own. Oh, and raising their first child. Now the original girls -- hence, the "OG" in the revived series title -- return to reveal the challenges of raising children on camera, and how life in the public eye has shaped them as parents and people. It's an unprecedented view of young mothers facing the responsibilities of parenthood as their children enter kindergarten, start little league and reach other milestones of youth.

Although unplanned teenage pregnancies have dropped by more than half since the early 1990s, nearly one in four girls get pregnant by age 20. TLC explores the complicated issue of teen pregnancy in "Unexpected" by focusing on three pregnant teen couples and how it affects their families. Cameras capture the various stages of each pregnancy and the first few weeks of parenthood. In each story, the pregnant couple is entirely unprepared to have a child, and it falls upon their parents or grandparents to help. Roles are blurred and tension begins to mount between the families, as everyone has their own ideas for what is best for the young parents and their child, from where they will live to when (or if) the couple should get married.

When it comes to dating on the island of Kodiak, Alaska, residents there often say, "The odds are good, but the goods can be a little odd." So six native Alaskan women -- fed up with scruffy men who are preoccupied with hunting and fishing -- cast their love line about 5,000 miles away in the sun-splashed and romance-filled city of Miami. This six-episode series documents how the women trade their rugged boots for high heels and fancy dates with firefighters, football players, personal trainers and cops. The cast includes Tina, who knows what she wants and how to get it; Jenny, who looks forward to ditching long socks and long johns for dresses and makeup; single mom Heather; Sabina, a free spirit who wants to be swept off her feet; quintessential Alaskan tomboy Lacy; and 22-year-old Haley, the youngest on the trip.

Older women and their much-younger men.