Darien helps a young woman who seems to be haunted by a strange apparition, and she is convinced it is her mother, who had disappeared mysteriously weeks before, trying to communicate with her.
The Keeper is accidentally injected with an experimental serum that could cause her to become permanently insane unless she can be given an antidote in time.
Darien goes to an acupuncturist who discovers his powers of invisibility and forces him to help her steal a set of ancient needles from a museum to treat her mentor, who is suffering from stomach cancer.
The agents are infected by a fatal form of Quicksilver-producing bacteria, and the Keeper must figure out how to stop it before they all die.
Darien decides to have himself injected with his brother's RNA in the hopes that he can discover how to remove the Quicksilver gland from his head.
Darien loses his memory after being struck by lightning, and Arnaud convinces him that he is his own brother and that his Agency friends are really trying to kill him.
Darien learns that the Keeper and the Official have been keeping antidote secrets.
A disfigured woman (Susie Park) tries to enlist Darien's help..
The agents are sent to capture a dangerous government assassin who is said to have switched allegiances, and Darien is stunned to discover that the man may be his own father, who has been missing for decades.
The sinister head of the SWRB discovers that Gaither is still alive and storms the Agency to recapture him, kidnapping Alex and stealing all of the Keeper's vital computer files in the process.
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