地球約有二百萬個生物物種，昆蟲佔過半數，而且型態、能力各異，極富多樣性。箇中關鍵「完全變態」，更是昆蟲的「獨門秘技」，可以由幼蟲到成蟲，徹底改變形態、棲息地甚至攝食習性。本節目利用3D掃描影像，首次曝光蝶蛹蛻變的完整過程、分析蜜蜂的飛行技術；更會揭開寄生蟻群的古怪昆蟲神秘面紗。節目揭示昆蟲針對棲息地、天敵以至繁衍而作出的精密演化，以及昆蟲在維持地球生態所扮演的重要角色。

Insects account for more than half of all the 2 million species of living organisms on the Earth. They are life's most diverse group, largely due to "complete metamorphosis"—a unique process transforming them from larva to adult, changing form, habitat, and diet. Using 3D imagery, the program reveals this metamorphosis, analyzes bees' flight, and explores insects living in ant nests. To survive, reproduce, and find food, insects have become highly specialized. Some are now so vital that their environments depend on them. Understanding insect evolution shows their critical role in supporting our planet.