What if a hurricane wiped out Houston, Texas, and terrorists attacked oil production in Saudi Arabia? "CNN Presents" looks at a hypothetical scenario about the vulnerability of the world's oil supply, the world's remaining sources of oil and explores the potential of alternative fuels.

No one knows how many thousands of Iraqis were killed in the war that toppled Saddam Hussein's regime. But if history is any guide, some of the troops who saw combat will come home to face a longer battle -- with their memories.

The sights, the sounds and the smells of killing may follow soldiers for years. CNN correspondent Candy Crowley examines the effects of war through the eyes of three combat veterans in "Fit To Kill."

An examination of how soldiers cope with killing in combat; and the impact it has on them once they return home. The documentary features insights from military historian David Steighan; retired Lt. Col. David Grossman, author of “On Killing”; neuro-biologist Dr. James McGaugh; and Col. Jim Stokes, an Army psychiatrist.

CNN Presents: Undercover in the Secret State follows Korean-American journalist Jung Eun Kim as she tracks down a new breed of dissident in North Korea. These dissidents are using small digital cameras and cell phones to show the world the brutal life inside North Korea.

A three-part CNN Presents documentary produced by Christiane Amanpour in which she examines the rise of religious fundamentalism as a political force in the world. The documentary was filmed in the United States, Europe and Middle East. It focuses on the three major monotheistic religions of the world, Judaism, Christianity, and Islam.

The three chapters are titled God’s Jewish Warriors, God’s Muslim Warriors, and God’s Christian Warriors. The first describes the Jewish settlement movement in Israel and the fund-raising in the United States that supports it, while the second presents issues of radical Islam and Sharia law. The final segment focused on the United States and the political influence of Christian religious leaders.

A three-part CNN Presents documentary produced by Christiane Amanpour in which she examines the rise of religious fundamentalism as a political force in the world. The documentary was filmed in the United States, Europe and Middle East. It focuses on the three major monotheistic religions of the world, Judaism, Christianity, and Islam.

The three chapters are titled God’s Jewish Warriors, God’s Muslim Warriors, and God’s Christian Warriors. The first describes the Jewish settlement movement in Israel and the fund-raising in the United States that supports it, while the second presents issues of radical Islam and Sharia law. The final segment focused on the United States and the political influence of Christian religious leaders.

A three-part CNN Presents documentary produced by Christiane Amanpour in which she examines the rise of religious fundamentalism as a political force in the world. The documentary was filmed in the United States, Europe and Middle East. It focuses on the three major monotheistic religions of the world, Judaism, Christianity, and Islam.

The three chapters are titled God’s Jewish Warriors, God’s Muslim Warriors, and God’s Christian Warriors. The first describes the Jewish settlement movement in Israel and the fund-raising in the United States that supports it, while the second presents issues of radical Islam and Sharia law. The final segment focused on the United States and the political influence of Christian religious leaders.

The story of Susan Stanton, formerly known as Steve Stanton, the one-time city manager of Largo, Fla., who was fired in 2007 after it was learned that she had decided to undergo a male-to-female gender change. The documentary chronicles her transformation.

Drew Griffin reports on an audit of North Carolina's State Bureau of Investigation's crime lab that uncovered irregularities in more than 200 cases, including three that resulted in the defendants being found guilty and executed.

Recalling the Branch Davidians, the cult led by David Koresh that came to a fiery end in April 1993 following a 51-day standoff with the ATF and FBI at their compound near Waco, Texas. Included: a timeline of events leading up to the tragedy; recordings of conversations between FBI negotiators and Koresh. Drew Griffin reports.

A profile of Prince William's fiancée Kate Middleton, featuring remarks from university friend Jules Knight and royal photographer Arthur Edwards. Also: how the pair have honored the life and legacy of Diana, Princess of Wales. Soledad O'Brien reports.

Drew Griffin examines the 2009 conviction of American exchange student Amanda Knox in Italy for the murder of her flatmate, focusing on the evidence used against her and prosecutorial behavior that may call into question her conviction. Included: an interview with the chief prosecutor, Giuliano Mignini.

Chris Lawrence reports on the long hunt for Osama bin Laden that ended May 1, 2011, with his death during a Navy SEAL raid on his Pakistan hideout. Included: insights from terrorism analyst Peter Bergen, former CIA director Michael Hayden, former CIA officer Gary Berntsen and CNN correspondents Barbara Starr, Ed Henry and Nic Robertson, as well as political analyst Gloria Borger.

Mel Gibson is profiled.

Detailing the tornado damage in the central U.S. Reporters: Drew Griffin; David Mattingly.

Detailing the tornado damage in the central U.S. Reporters: Drew Griffin; David Mattingly.

Kaj Larsen reports on WikiLeaks and its founder, Julian Assange, detailing the controversy that surrounds the Web site and the evolution of Assange from hacker to provocateur. Included: remarks from Assange via interviews he gave journalist Mark Davis, former WikiLeaks spokesman Daniel Domscheit-Berg, Brig. Gen. Mark Kimmitt (USA Ret.) and Guardian journalist Nick Davies, who shares the concerns he had with Assange's decision to release sensitive military reports without redacting names.

Amber Lyons reports on the roles played by online activists in fomenting change in North African and Middle Eastern countries, including Tunisia and Egypt. Also: the revolutionary movements in Libya, Syria and Yemen.

The U.S. space shuttle program is examined. Included: NASA administrator Charles Bolden on NASA's future; a family that witnessed the first shuttle launch in 1981; inside Discovery, the shuttle that has flown the most flights; the site in Utah where the shuttle boosters were built. Reporter: John Zarrella.

Brooke Baldwin reports on an effort to solve a series of slayings of young Midwestern women by sending a convicted drug dealer into a prison to befriend the man suspected of killing them.

Larry King interviews the cast of "Harry Potter and the Deathly Hallows: Part 2," including Daniel Radcliffe, Emma Watson, Rupert Grint, Tom Felton, Helena Bonham Carter and Robbie Coltrane. Also: James and Oliver Phelps (aka the Weasley twins) lead a tour of the Wizarding World of Harry Potter at the Universal Orlando Resort in Florida.

The hunt for and arrest of alleged Boston mob boss James "Whitey" Bulger; the U.S. presence in the Arctic; the sport of cheerleading.

Possible civil-rights abuses in Minneapolis' Anoka-Hennepin school district, where bullied students have committed suicide; the mystery behind the bodies of four prostitutes found along a Long Island beach; a Costa Rica refuge for poached monkeys.

Among the heroes of September 11th were female rescue workers who raced to the Twin Towers in the wake of the attack. Anchor and special correspondent Soledad O’Brien tells the stories of female law enforcement officers, fire fighters, EMS workers and others who spent their lives defying macho stereotypes as they fought for access to jobs that require them to risk their lives for others. Among the heroines is an African-American probationary firefighter whose company lost 7 of the 343 that died that day, and a young mother and decorated police officer last seen directing others to safety just before the WTC collapsed. O’Brien profiles these unsung heroes and, of the survivors, reports their present-day health struggles, their continuing mourning, and their determination to be prepared for the next attack.