Calvin's duplicator and wild experiments take center stage in this beloved collection, covering September 1989 to July 1990. Multiple Calvins, time-travel escapades, and cardboard-box inventions fuel nonstop hilarity, while Stupendous Man, Spaceman Spiff, and Tracer Bullet make standout appearances. Snowball wars, mutant armies, and spirited debates about science, ethics, and creativity push Calvin's imagination to its limits, with Watterson's unmatched ability to mix slapstick, satire, and thoughtful reflection on full display. This volume also includes The Yukon Song, original material created especially for the collection.

• Paperback
• 128 pages
• 8.7" x 0.5" x 9.2"
• Ages 8+