Sam Stevens was a United States Navy Master Diver with the rank of Chief Petty Officer.   As a Master Diver, he was extremely experienced in hundreds of classified and dangerous dives, most of which were military related and/or rescues (or recoveries). Even when he faced death on several occasions, he always came out thanks to his patience and perseverance. His attitude towards everyone and everything around him was professional, however, he always had a combative, in-your-face demeanor that earned him an antithetical nickname of "Sunny".  In 2009, he was given a secret mission that changed his career...and life...forever.

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In 2008, the US Navy, while contracting Dr. Robert Ballard to discover a lost Japanese World War II battleship wreck, discovered the armored remains of the Allied Fighters' long-lost heroic teammate, Sargasso Sailor.  The Sargasso Sailor was on a mission in World War II (WWII) to 'mine' the same Japanese battleship (and two other Japanese ships) that supposedly he sunk.  Dr. Ballard's team found the armor and reported it to the US Navy. After several months of planning, the US Navy assigned Chief Stevens and his team to be the ones to do the deep dive to recover Sargasso Sailor's remains and armor.  In 2009, when Chief Stevens performed the dive, the recovery went completely wrong.

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The World War II hero, Sargasso Sailor, was a Greek sailor who had mysterious 'magical seaweed' attached to his arm and back. Although the Sargasso Sailor was interrogated intensely about the 'seaweed' (and not offering up much of anything about it), it was initially considered 'harmless' and seemed more of a parasite than a threat. The 'seaweed' was an amazing item that allowed the WWII hero to swim at fantastic underwater speeds, outracing torpedoes and fast boats alike.  Documentation about Sargasso Sailor was lost in a records warehouse fire in the 1960s, and as such, no one alive by 2009 had much info on Sargasso Sailor or his seaweed, other than his WWII team leader of the Allied Fighters, Major Invader, who simply stated "He's dead, what more do you need to know, because I don't have diddly on what that magical seaweed was'.   As such, when Chief Stevens went to do the recovery he was unprepared for what he was about to experience.

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The 'magical seaweed' on the Sargasso Sailor armor was still alive.

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No one had any idea that the 'seaweed' was even still on the body, after reviewing Dr. Ballard's video footage of the armor's find in 2008. The 'seaweed' was found when Chief Stevens attempted to move the heavily rusted armor onto a recovery platform. In so doing, the 'seaweed' jumped out from under Sargasso Sailor's armor and latched onto Chief Stevens dive armor. It didn't attack Stevens, but it wasn't about to be removed or let go either.  As such, a command decision had to be made; a decision to either disconnect Stevens and let him (and supposedly the 'seaweed') die and not contaminate the surface ships, or, to bring up Stevens and place him in a decompression chamber and isolate 'them'.  They chose the decompression chamber and isolating 'them'.

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After 2 weeks in the decompression chamber (and hundreds of scientists' inputs), it was determined that the 'magical seaweed' was alive and not some type of unliving magical energy. It showed intelligence and reacted to being removed from Stevens, of which, Stevens now seemed to be its new host.  Stevens, unhappy over the situation, realized that until this 'thing' could be removed, he'd have to live with it.

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Rather than isolate Stevens from the world, the US Navy instead 'trained them' as a new project, simply called: "Project: Sargasso".  As such, Stevens and the entity actually began to communicate; the entity actually communicated with black and white flash-type imagery into Stevens' brain. In so doing, the seaweed entity happily and easily worked with Stevens, exhibiting incredible powers and abilities even greater than anything the original Sargasso Sailor had display. As such, with a new high tech submersible suit, Stevens and the entity performed beyond expectations. Sadly, the US Navy dropped the project after it was leaked to the media, which immediately started making Stevens and the entity out as a 'living weapon', assigning 'animal rights' to the entity, with benevolent organizations demanding 'releasing' the entity and 'letting it free'.  Of course, this is NOT what the entity wanted (Stevens, on the other hand, would've been more than happy for the separation, but wasn't about to do so if it would cause the entity's death (or it'd latch on to another person), which is what he presumed would happen). As such, Stevens attempted to leave the Navy and was instead sent to Leavenworth, Kansas for breaking the Uniformed Code of Military Justice (UCMJ) by actions 'unbecoming a member of the armed forces'. He was only jailed for one week before an organization named GUARD released him under their international cognizance.

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After being brought to a GUARD facility, Stevens was asked if he would be interested in using the entity and itself for good, along the same lines of what the previous "Sargasso Sailor" was doing, but this time, with GUARD and not because of a war.  Stevens immediately agreed. In the months to come, the US Navy did a judicial review of the charges against Stevens and reversed their findings. As such, Stevens was allowed to have an 'honorable' discharge and receive his pension from the Navy. 

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Today, "Chief Sargasso" as he is known now, continues working with GUARD as a member of the Seaguardians group; a sub-unit of GUARD's mega-group, the Guardians.  He and the entity have never been happier. They've worked out a 'lifestyle' symbiosis allowing Stevens to carry on some form of social and personal life, wherein the entity "goes dormant" inside of Stevens. As such the two are capable of incredible undersea feats, making them a powerful team of two in the Seaguardians.

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