This book explores the colossal marine reptiles that coexisted with dinosaurs. It delves into the world of prehistoric sea giants, examining their anatomy, behavior, and the environments they inhabited during the Mesozoic Era. The text likely draws on paleontological evidence to reconstruct these ancient ecosystems and the dominant predators within them.

The book is likely aimed at a general audience interested in dinosaurs and prehistoric life, offering an accessible overview of marine reptiles from that era. Its focus on 'sea giants' suggests an emphasis on the impressive scale and predatory nature of these creatures. The inclusion of 'Meet the Dinosaurs' in the series title indicates a format that is educational and engaging for younger readers or those new to the subject. The author, Don Lessem, is known for his work in popularizing dinosaur science, suggesting a reliable and informative approach to the topic.