We don't want you to miss a thing, so we've put some previously featured videos here.

Stellar Storms
Take a trip around the cosmos to see some of the universe's most extreme weather.
Cosmic Collisions
Could an asteroid impact with Earth wipe out the human race?
Decoding the Skies
Known Universe examines mankind's first observations of the cosmos to understand how they put us on the path to modern discovery.
Alien Contact
Are we alone? Known Universe joins the hunt for alien life as scientists search for planets with similar characteristics to Earth's.
Gang Task Force
Agents apprehend an alleged Miami gang member and turn him into an informant, while a patrol is on the lookout for illegal immigrants.
City Under Siege
Officers raid a house run by suspected human smugglers and uncover a secret tunnel below city streets.
Last Defense
CBP Officer McNamara stops a vehicle that reeks of gasoline and discovers a hidden compartment that could hold narcotics.
The Front Lines
Officer Hector Navarro stops a silver pickup truck at the Nogales port of entry -- and ends up breaking a drug bust record.
Dead of Night
Pilot John Manheimer and his team patrol the Sonoran Desert searching for illegal border crossers and drug smugglers.
No End in Sight
NGC goes to the border to examine the growing tide of illegal activity that includes human and drug smuggling.
Checkpoint Texas
A truck carrying more than 1,000 pounds of concealed marijuana is discovered by a rookie agent and his canine partner.
Death on the Rio Grande
A young man drowns trying to cross the Rio Grande, and agents must now identify him and return his body to his family.
Lost in the River
Agents apprehend a group of suspected drug smugglers while another team discovers the bodies of three missing people in the Rio Grande.
Cartel Crackdown
Agents face off with smugglers and bust a suspected coke house.
High-Speed Chase
Officers intercept a spare tire packed with hundred dollar bills, and a SWAT team prepares to bust a stash house.
Midnight Drug Run
Agents apprehend a suspected drug smuggler on a boat and he agrees to cooperate, offering a rare chance to bust gang-affiliated dealers.
Super Sunday
It's a week before Super Bowl XLIV in Miami, and agents execute rigorous drills on land, water and in the air to prevent a security breach.
Storm Surge
A truck loaded with canned jalapeƱos is searched in Laredo and found to have a spicy load - 3,109 pounds of marijuana worth $3 million.
Weed Warehouse
A high-speed chase results in a stolen vehicle flipping over. Its driver takes off running, abandoning a huge load of marijuana.
Russell Thoresen's new girlfriend lures him to Peru where he is trapped in an epic cocaine smuggling nightmare.
Clare Mathews subsidizes her crazy party lifestyle by stuffing statues with hashish - until she ends up in one of the world's largest jails.
Busted in Mexico
Silva attempted to smuggle 33 pounds of marijuana out of Mexico, he was caught and sentenced to prison.
Puerto Vallarta
The extraordinary story of Jake Libbon, wrongly accused of the shooting of two policemen during a drug bust in Mexico.
Chris Parnell spent 11 years in a prison nightmare when he was locked up in Indonesia after being convicted of smuggling hashish in 1985.
Sierra Leone
Major Phil Ashby attempts to disarm child soldiers in Sierra Leone, but he becomes the personal target of an angry rebel warlord.
Kidnapped in the Philippines
Missionary Greg Williams escapes after being kidnapped by members of the Islamic terrorist group Abu Sayyaf and tortured for 13 days.
Brendan Cosso and three friends are arrested trying to smuggle cocaine out of Brazil and end up in a notorious South American prison.
A blues musician deceives his girlfriend and attempts to make some money by smuggling cocaine out of Venezuela.
Zara Whittaker knew she was smuggling drugs but she didn’t know she was carrying a baby too.
Two journalists are captured by insurgents after entering a northern Iraqi town to report on an impending battle.
Betrayed in Ecuador
Zoe McGarry was locked up in an Ecuador jail for cocaine smuggling, although she claimed a friend tricked her into carrying the drugs.
TK White and her girlfriend are offered a vacation to Jamaica and $5,000 in return for bringing back marijuana.
Taboo: Marriage
In some cultures, marriage has a broader meaning than one man and one woman.
Signs of Identity
Marks of identity are not always about the art. In Japan, tattoos mark criminal gangs. In Canada, "branding" tests courage.
Sexual Identity
From transsexuals in America to the katoey in Thailand, find out how far people will go to become the person of their dreams.
Body Modification
See what makes people radically reshape their bodies -- from neck stretching in Thailand to breast ironing in Cameroon.
Gross Food
Cockroaches, worms and the still-beating heart of a snake are traditions, even delicacies, in some societies. Enjoy, if you dare!
Want to clean up violent crime scenes or examine rotting corpses on a body farm? NGC explores creepy careers.
Initiation Rituals
Initiation gives us a sense of belonging to something bigger than ourselves -- but everyone has limits.
The desire to find a mate is one of humanity's fundamental instincts, but what happens to men and women when their love is taboo?
Easter Island Underworld
On legendary Easter Island, scientists undertake a groundbreaking expedition: to map a vast cave system.
Secret History of Diamonds
From a warlord's coffers, to the prestigious diamond market. Just how far are we willing to go to possess these remarkable jewels?
Albino Murders
In Tanzania, where albinos are killed because of witchcraft, an albino soccer team has formed to dispel myths surrounding them.
Marijuana Nation
Lisa Ling steps into the world of marijuana cultivators, reporting from secret farms and not-so-secret grow houses.
The Angel Effect
A 9/11 survivor, an astronaut and a sea diver - each felt a mysterious presence that guided them to safety in their time of greatest peril.
Born To Rage?
Ex-punk rocker Henry Rollins is on a mission to figure out why many.
Tiny Humans: The Hobbits of Flores
In an extraordinary discovery, scientists find prehistoric evidence.
Inside Death Row
Death Row talks to inmates approaching execution in Huntsville, TX.
Inside Sumo
This ancient Japanese tradition is more than a sport, it's a way of life.
Science of Babies
Explore the remarkable plasticity of a baby's brain and see how early babies transform from the most vulnerable being to the most capable being.
Python Wars
The Burmese python, one of the largest, most powerful snakes in the world.Burmese Pythons are invading America and no one knows were they are coming from.Watch how scientists are trying to crack the puzzle of the invading Burmese python.
How to Build a Beating Heart
Scientists are beginning to harness the body’s natural powers to grow