The tough and fearless Marine Lieutenant Colonel Bill Kelly who has made his career as a top gun fighter pilot and war hero unwillingly faces a new mission: to take a band of talented, determined young Marines, and turn them into an elite multi-skill crisis task force.
The Sea Dragons' mission to rescue DEA agents taken by a Central American drug cartel becomes extremely dangerous, when they're forced to also free a family held hostage at the same time as they are searching for the government witness who betrayed them and escaped.
When an unstable Marine steals a four million dollar piece of top secret equipment, the Sea Dragons are called in to get it back at any cost. Meanwhile, Kelly has no choice but to dig deeper in order to connect with his estranged daughter, Janine.
The Sea Dragons are assigned to shut down a high-tech drug lab that is producing a deadly virus that can be used as a chemical weapon. The stakes get even higher when one of their own is infected by the virus which has no antidote.
Someone is killing men Kelly served with in Vietnam with napalm. He later learns that it might have something to do with a mission that he didn't take part in because he got ill. And when attempts are made on him he asks Griffin to keep an eye on Janine. Later he learns some Vietnamese are in town so he has them checked out. But he learns they're not the ones. He thinks it's someone else closer.
The Sea Dragons are given a deadly peace-keeping mission in North Korea and Lt. Col. Kelly helps a distressed American father look for his rebellious daughter who has vanished into the shady night life of South Korea.
A Sheriff goes to talk to Kelly about a former member of the team, cause it seems that he's behaving erratically. But he doesn't know anything because he took over the team after the man left. The team decides to go and see what's up with him. Kelly offers to go but Griffin tells him that something might be up with Janine so he stays.
When a new drone is being tested, they suddenly lose control of it. So the team is sent to a town where the man who designed the computer system lives and works. It seems who took control of the drone lives there.
When there's a coup in a country who is a friend of the U.S. and the President and some people are being held captive. Kelly and his team are sent to see what they can do. And they attempt a rescue operation but a group of mercenaries who were hired by a wealthy man to rescue his daughter who is among the ones being held. And when they fail, Kelly has to come up with another plan.
The Sea Dragons are tasked to uncover whether an unknown issue with a state-of-the-art missile launch system has already cost one life and might cause another: that of Bobby Griffin, its chosen test pilot.