Matt and Slade go surfing and the one who falls first backs off and lets the other one have Summer. Matt falls first, but his board falls into a cave. An octopus lives in the cave and it takes care of the board. Matt and Slade tell Mitch about it and he tells them about the cave. The cave is said to be a surfboard cemetery and Ben visited the cave once. When Mitch has told them that, Matt and Slade decide to explore the cave and Summer agrees to go with them.
s04e01 - Race Against Time (Part 1)
s04e02 - Race Against Time (Part 2)
s04e03 - Lover's Cove
s04e04 - Blindside
s04e05 - Sky Rider
s04e06 - Tentacles (Part 1)
s04e07 - Tentacles (Part 2)
s04e08 - Submersion
s04e09 - Ironman Buchannon
s04e10 - Tower of Power
s04e11 - The Child Inside
s04e12 - Second Time Around
s04e13 - The Red Knights
s04e14 - Coronado Del Sol (Part 1)
s04e15 - Coronado Del Sol (Part 2)
s04e16 - Mirror, Mirror
s04e17 - The Falcon Manifesto
s04e18 - Rescue Bay
s04e19 - Western Exposure
s04e20 - The Life You Save
s04e21 - Trading Places
s04e22 - Guys & Dolls
This long-running series follows the adventures of a team of lifeguards on the crowded beaches of Los Angeles County. Veteran lifeguard Mitch Buchannon watches over the younger lifeguards that come and go with each passing season as they keep the beaches safe for vacationers. Frequently he must take action to save them from the raging seas and from the raging tempers that sometimes flare up between the young guards in this stressful job.