Season 21

Natasha's new life after her parents' divorce contains alcohol and drug-fueled parties, and she later begins using harder drugs like crystal meth and heroin. Now a full-blown addict at 22, Natasha has a chance to start her life over.

Shandon's early life was disrupted at 3 years old when her parents divorced and her mother moved out of the country. Now in her mid-20s and saddled with a $200-a-day intravenous habit, she prostitutes herself to feed her addiction.

Coleman began experimenting with alcohol and drugs after his father died. His drug use caused him to lose custody of his 4-year-old daughter. His family worries his addiction may kill him.

When she was a teenager, Courtney's moodiness turned to rebellion and she began to experiment with drugs. Now, she no longer cares about her health or safety.

Nathan was a promising young athlete until a painful injury left him with an addiction to prescription opioids. His family is afraid that he will meet an unfortunate end if there isn't an intervention.

Chelan was a devoted wife and mother until the breakup of her marriage sent her spiraling into the world of prescription opioid abuse. Three years later, Chelan is homeless, works as a prostitute and is no longer allowed to see her three little boys.

Robin once overcame a drinking problem to become a successful pilot, but the stress of being away from his wife and children drove him back to booze. It didn't take long before Robin's problem destroyed his career and family. Robin's parents and brothers believe the brilliant pilot is still in there somewhere, but without an intervention, they're fearful that Robin may spiral to a horrible death.

Melanie was just eight months old when her dad committed suicide. Her mother's subsequent trauma went untreated, and she struggled raising her three kids. Melanie, the youngest, suffered the most. She began acting out and getting in trouble to gain attention. When she was nine, she was diagnosed and medicated for ADHD. Then, at 14, Melanie was introduced to crack cocaine by an older boyfriend. She was instantly hooked and ended up in rehab at 15. Melanie got clean and turned things around, going back to school and becoming a Personal Support Worker - a vocation that she loved. At 19, shortly after a breakup, Melanie found out she was pregnant and her ex-boyfriend wanted no part of being a father. She loved her son and was a good mother but, four months after giving birth, she became depressed and starting using crack cocaine again. Now, five years later, Melanie is saddled with a severe addiction. Without an intervention, Melanie will lose custody of her son, or worse, lose her life.