Revelation 12:3-4
And another [supernatural] sign was seen in heaven; it was a huge red dragon with seven heads and ten horns, and on each of his seven heads was a crown.
Revelation 12:16-17
But the earth helped the woman by opening up its mouth and swallowing the torrent of water which the dragon had spewed out of his mouth.
Revelation 13:2
And the beast I saw was like a leopard, and his feet were like a bear's, and his mouth like a lion's. And the dragon gave him his power, his throne and his great authority.
Revelation 13:4
And they [all] worshiped the dragon because he had given authority to the beast. And they worshiped the beast, saying, "Who is like the beast?" and "Who is able to wage war against him?"
Revelation 13:11
Then I saw another [i.e., a second] beast coming up from the earth. He had two horns like a lamb and spoke like a dragon.
Revelation 16:13
And I saw three evil spirits that looked like frogs; [one was] coming out of the mouth of the dragon, [one] out of the mouth of the beast, and [one] out of the mouth of the false prophet.
Revelation 20:2
And he took hold of the dragon, that old snake, who is the devil or Satan, and chained him up for a thousand years.