Mega Disasters is a History Channel original series that explores hypothetical catastrophic threats to individual cities - countries and the entire globe. The two mega disasters of the 2004 tsunami and Hurricane Katrina in 2005 inspired the series and provided a reference point for many of the episodes. Excepting only two shows devoted to man-made disasters , the threats explored can be divided into three categories: meteorological, geological, and cosmic.

Each episode follows a general pattern: 1) introduction teasing the catastrophic outcome of the threat, 2) background on the science and scientists warning of the threat, 3) presentation of similar previous disasters, 4) recap of the evidence, and finally, 5) a realistic scenario using computer models and special effects to flesh out the tantalizing details of the disaster.

Season One

1. West Coast Tsunami
The United States faces a potential tsunami threat that mirrors the catastrophic Indonesia tsunami of 2004. Just west of the Oregon coast lies the Cascadia subduction zone where the Juan de Fuca Plate is moving under the North American Plate. A major earthquake here could displace enough water to cause a massive tidal wave to impact along the west coast.

2. Tornado Alley Twister
A Dallas, Texas tornado event is examined.

3. New York City Hurricane
New York City suffers a Katrina-like disaster.

4. American Volcano
Mt. Rainier is a ticking time bomb that could dwarf the Mt. St Helens eruption, sending massive lahars and mudslides toward the Seattle-Tacoma metropolitan area.

5. Asteroid Apocalypse
The possibility of a cosmic impact on the the planet Earth is examined.

6. Earthquake in the Heartland
The New Madrid Fault could reawaken at any time and destroy St. Louis and Memphis, like the New Madrid Earthquake of 1811-12.

7. Yellowstone Eruption
Yellowstone National Park lies on top of a magma chamber that is 35-miles wide, waiting to erupt. For the Wikipedia article, see Yellowstone Caldera

8. Windy City Tornado
Chicago is menaced by three fictional tornadoes.

9. East Coast Tsunami
An volcano island off the northwestern coast of Africa in the Canary Islands is collapsing; if it does, a massive tsunami will be headed right for the East coast of the United State , threatening major cities like New York, Boston, Baltimore, and Miami.

10. Firestorm
The 1917 explosion that killed 2000 people in Halifax could happen again if everything went exactly the wrong way in Boston.

11. Mega Freeze
Ice ages can come and go under an abrupt climate change scenario.

12. California's Katrina
What if a super storm causes a Flood in Sacramento, California?

Season Two

1. Comet Catastrophe
A comet is imagined to strike the Earth and cause major devastation.

2. Gamma Ray Burst
Every few seconds, a supernova emits jets of deadly gamma rays somewhere in the galaxy. If one of these gamma ray bursts should happen sufficiently close to the solar system, all life would perish.

3. Krakatoa's Revenge
Another eruption at Krakatoa could spell curtains for Indonesia.

4. Hawaii Apocalypse
The shield volcanoes that make the Hawaiian Islands can easily break off and cause mega-tsunamis.

5. Methane Explosion
Methane gas precipitates out of the Earth's crust but is easily diluted in the air and in the oceans. Yet, according to one scientist, certain oceanic conditions could trap the gas in regions with low water circulation and build up extreme pressure. Once these areas are disturbed, the gas would blow out of the ocean in powerful jets. If they ignited before diluting, the explosion could cause widespread devastation. The scientist also posits that a similar event caused the Permian extinction.

6. Glacier Meltdown
As temperatures rise, a global meltdown has begun. From the Andes to the Himalayas to the Alps, glaciers are vanishing. In Antarctica and Greenland, vast ice sheets are turning into liquid. The melting ice, running off land, is raising sea levels. As sea levels rise, oceans throughout the world are also becoming hotter. Warmer seas fuel more intense hurricanes. Already, major catastrophes brought on by the process of melting ice, rising seas and intensifying storms have occurred in coastal communities around the world: the South Pacific, Bangladesh and--closer to home--New Orleans. Scientists predict that the worst is yet to come. The rising oceans may swallow some lands forever. By the turn of the century, the map of the world may need to be redrawn and a Category 4 hurricane could drown much of Washington, DC in 15 feet of water.

7. Alien Infection
Chandra Wickramasinghe, a scientist who accepts the panspermia hypothesis, also claims that the SARS outbreak and the 1918 flu pandemic were caused by alien viruses. While some episodes in this series have been at best improbable, this is the first to explore a theory on the extreme fringes of science. One piece of evidence cited in the episode is that the Spanish Flu appeared on different continents on the same exact day. In fact, the flu first appeared many months before this day in Kansas. Moreover, the supposed simultaneousness of the outbreak contradicts his own theory of how these hypothetical alien viruses spread, originating in the thin atmosphere of the Himalayas and continuing on to the rest of Asia. The theory also raises the (unanswered) question, How could a flu virus from space be genetically similar to existing viruses? Viral evolution is a simpler answer than a cometary origin; Occam's Razor suggests choosing the former theory over the latter.

8. New York Earthquake
An earthquake in New York City may seem like the plot of a bad movie, but a magnitude 5 quake occurred in 1884 and could happen again. Two faults run under Manhattan Island, including the 125th Street Fault where the landscape dips and the subway crosses on an open bridge. Since skyscrapers are designed to withstand windspeeds of 100MPH, most would survive sans windows; however, mid-sized masonry structures would collapse. As well, buildings (including smaller skyscrapers) built on landfill in Battery Park are subject to soil liquefaction, tipping over entirely in a major earthquake.

9. Mega Drought
Trends indicate that a major drought event is looming in the not-too-distant future. In as few as three decades we could experience conditions that would make the Dust Bowl of the 30s seem like an oasis. Efforts to conserve, while admirable and desperately necessary, may already be too late. In stark detail MEGA DISASTERS projects a scenario seventy years down the road in which a twelve-year drought leaves the United States unstable and economically depressed. Western cities are abandoned, states clash for dwindling water supplies and society devolves into a battle for survival.

10. Super Swarms
The locust is one of the most destructive and dreaded life forms on Earth. American pioneers faced the largest swarm of locusts ever recorded. The 1,800 mile long and 110 mile wide cloud of insects ate their way through the heartland and blocked the sun for five days. Famine ensued, and thousands faced starvation. According to recent studies, the possibility of such a swarm returning to the United States is very likely. The destruction would be unimaginable.

12.L.A.'s Killer Quake

It has been a century since the infamous 1906 San Francisco earthquake and Californians live with the knowledge that it's only a matter of time before they're hit again. Los Angeles is the second most populous city in America. If an earthquake hit directly beneath downtown LA, scientists believe that tens of thousands would be killed. Just how would the city respond to a 7.5 magnitude quake? Take a look at how well the emergency responders could cope. A CGI worst-case scenario will show the incredible damage and destruction that would cripple one of the most important cities in the world.

13.The Next Pompeii?

In 79 AD Mt. Vesuvius destroyed Pompeii and killed 5,000 people. The volcano is quiet at the moment, but the only consistency in Vesuvius' eruptive history is a lack of consistency. The danger zone that surrounds the volcano includes the city of Naples and its one million residents; another two million people reside nearby. Scientists know that when Vesuvius erupts again they won't have much warning and another major metropolis will be destroyed.