7.53 avg 11 episodes 7.8 → 7.2 45 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | West Coast Tsunami | 7.8 | 11 |
| 2 | Tornado Alley Twister | 6.9 | 12 |
| 3 | New York City Hurricane | 7.1 | 10 |
| 4 | American Volcano | 8.8 | 11 |
| 5 | Asteroid Apocalypse | 7.5 | 12 |
| 7 | Yellowstone Eruption | 7.9 | 14 |
| 8 | Windy City Tornado | 7.8 | 9 |
| 9 | East Coast Tsunami | 8.2 | 9 |
| 11 | Mega Freeze | 6.1 | 11 |
| 12 | California's Katrina | 7.5 | 9 |
| 13 | San Francisco Earthquake | 7.2 | 14 |
6.65 avg 13 episodes 6.6 → 6.8 45 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Comet Catastrophe | 6.6 | 11 |
| 2 | Gamma Ray Burst | 7.2 | 15 |
| 3 | Krakatoa's Revege | 7.2 | 16 |
| 4 | Hawaii Apocalypse | 6.1 | 11 |
| 5 | Methane Explosion | 6.1 | 11 |
| 6 | Glacier Meltdown | 8.1 | 9 |
| 7 | Alien Infection | 6.5 | 15 |
| 8 | New York Earthquake | 6.1 | 9 |
| 9 | Mega Drought | 6.7 | 11 |
| 10 | Super Swarms | 6.3 | 14 |
| 11 | Oil Apocalypse | 6.2 | 17 |
| 12 | L.A.'s Killer Quake | 6.6 | 13 |
| 13 | The Next Pompeii? | 6.8 | 18 |
6.96 avg 8 episodes 8.0 → 6.6 45 min avg
| # | Title | Rating | Votes |
|---|---|---|---|
| 1 | Hypercane | 8.0 | 11 |
| 2 | Noah's Great Flood | 6.7 | 15 |
| 3 | Mega Tsunami | 6.4 | 16 |
| 4 | Volcanic Winter | 6.6 | 14 |
| 5 | Dam Break | 8.2 | 8 |
| 6 | Glow Train Catastrophe | 6.8 | 8 |
| 7 | Atlantis Apocalypse | 6.4 | 12 |
| 8 | Comet Storm | 6.6 | 7 |
