"Seasonal Seas" focuses on the explosion of life that accompanies every annual blooming of plankton, numbering in the countless billions and captured here with brilliant microphotography. In "Coral Seas," miles-long reefs of living coral are explored, from deep within (requiring brief computer animation) to the surrounding environs, where you'll see white-tipped sharks in a feeding frenzy while beautiful harlequin shrimp wrestle with a starfish. "Tidal Seas" explores the myriad life forms that thrive when lunar gravity pulls the oceans offshore. "Coasts" is easily the most brutal episode, but no less mesmerizing. The most unexpected, and horrifying, sequence is the orca, earning its "killer whale" nickname by capturing, killing, and tail-tossing a seal pup--a sequence so mysteriously primal that even the most seasoned marine biologist will be utterly amazed. One of the finest wildlife programs you're ever likely to see, The Blue Planet: Seas of Life provides the privilege of visiting a truly alien world teeming with the rarest wonders of nature. The series was recut into the feature-length Deep Blue in 2005. --Jeff Shannon