This is a rare and valuable copy of The Uncanny X-Men #221, featuring the first appearance of Mr. Sinister in a newsstand variant. The comic was published by Marvel Comics in 1987 and is in English language. It belongs to the Copper Age era of US comics and is part of the Comics & Graphic Novels, Comic Books & Memorabilia, and Collectibles categories. The series title is The Uncanny X-Men, and the issue number is 221. This item is a must-have for any comic book collector or fan of the X-Men franchise.