The CW just has released the first trailer for The 100 season 4, featuring the return of Clarke Griffin and Bellamy Blake in the backdrop of a nuclear disaster. The season 3 ended with Clarke making a doomed decision by pulling Alie's "kill switch", thereby destroying humanity's only chance of survival from an impending nuclear apocalypse.

Premiering on 1st February, the trailer highlights the struggle that the group will face to merely survive, as life on earth will become increasingly difficult to live on, thanks to radiation.

The promo opens with a warning from the A.I: "The end is coming. The nuclear power plants that were destroyed by the bombs have begun to melt down. 96% of the earth's surface will be uninhabitable. Black rain will come first, there will be no drinkable water. Precancerous lesions will form. Death is inevitable. Let me ease their pain, Clarke. We can save the human race together."

But Clarke refuses her help and says: "You don't ease pain, you overcome it." The trailer paints a grim picture of Clarke, Bellamy and the crew's future as people begin to feel the effect of radiation immediately.

Clarke says throughout the trailer, "I know you're afraid. I know you're angry. But if we stick together, we won't just survive. We'll thrive." With death looming, the group is seen battling several enemies. Azgeda king Roan is seen leading his massive army towards Clarke, Octavia is still vengeful, and Monty has started questioning Clarke's intentions.

There is some good news for Bellamy and Clarke fans as he is seen giving emotional support to Clarke by putting his hand on her shoulder in the 3-minute video. Later in the trailer she asks Bellamy, "You still have hope?" to which he replies, "We are still breathing!"

The shocking part comes at the end of the trailer as we see Clarke's disfigured face, confirming that she is not immune to the brutal effects of the radiation that Alie warned her about. The video ends with a hopeful message, "We will rise from the ashes."

The 100 season four premieres Wednesday, 1 February at 9 pm ET on The CW Network.