Revelation 20:1-3, 7-10 describes the final events surrounding Satan

Revelations 20:1-3, 7-10
And I saw an angel coming down from heaven, having a key of the abyss and a great chain in his hand. And he laid hold of the dragon, the serpent of old, who is the devil and Satan, and bound him for a thousand years, and threw him into the abyss, and shut it and sealed it over him, so that he should not deceive the nations any longer, until the thousand years were completed; after these things he must be released for a short time.

And when the thousand years were completed, Satan will be released from his prison, and will come out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together for the war; the number of them is like the sand of the seashore. And they came up on the broad plain of the earth and surrounded the camp of the saints and the beloved city, and fire came down from heaven and devoured them. And the devil who deceived them was thrown into the lake of fire and brimstone, where the beast and the false prophet are also; and they will be tormented day and night forever and ever.

When Christ comes to reign on earth, He will immediately empower an angel to bind Satan in the abyss for a thousand years. During the time when Satan is bound is the millennium. At the end of the thousand years Satan is released and isgiven one last chance to raise an army and try to defeat God. Satan raises and army and God immediately destroys them with fire and brimstone. Satan is then cast into the lake of fire forever.

Read more in The Complete Book of Bible Prophecy