The team races to an Antarctica research base to investigate why a climate scientist killed a colleague on Polar Night Eve – and make it out before their plane engine freezes and they're trapped in darkness for six months.

When a U.S. naval officer is arrested for murder while trying to destroy a treasure map, the team must navigate jurisdictional politics to uncover the truth while racing to find the fabled "Yamashita's Gold,".

Confronted with Australia's first case of Ebola, the team races to uncover how patient zero, a U.S. Navy scientist, contracted the deadly virus, only to have their search for answers complicated by a top-secret military research agency as two of their own fight for their lives.

When a U.S. Navy attaché is found dead with a USB lodged in his throat, the team tracks a killer believed to have ties to an international chess tournament in Sydney.

When a U.S. Navy pilot goes missing at a UFO hotspot in the Outback after being chased by blinding lights, the team must discover if the truth is really "out there,"

The team's hunt for a high-value U.S. target accused of murdering an Australian soldier takes an unexpected turn when the suspect claims to have evidence of a war crime.

Growing increasingly worried about Blue's strange behavior, Doc takes matters into his own hands and breaks into her apartment. Inside, DeShawn and Evie stumble onto a startling revelation that forces the team to question just how well they really know one of their own.

The discovery of two missing U.S. Navy aviators adrift in the Coral Sea leads the team to expose a sinister terrorist plot.