There’s a selection of graphic novels being offered on Amazon for $3.99 or less right now, and that selection includes a lot of Doctor Who graphic novels that are perfect for tween and teen sci-fi fans. For example, the highly-rated Prisoners of Time trilogy:
November 23, 1963: A day that changed the world forever. That day saw the broadcast debut of Doctor Who, which was to become the longest-running science-fiction series on television. And now, 50 years later, we pay tribute to one of the greatest pop-culture heroes of all time with this special series, which tells an epic adventure featuring all 11 incarnations of the intrepid traveler through time and space known simply as… the Doctor. Collects issues #1–4.