Vanessa, the new girl on ORCA, doesn't take her welcome-prank too well. As an act of revenge, she pulls a prank on Brett. Only that her prank turns dangerous when a storm approaches.
Jason talks to Neri about the divorce of his parents. Meanwhile, Dianne is trying to convince Commander Lucas to ratify new equipment for her lab and Brett is convinced that his mother wants Commander Lucas to be his step-father.
Neri brings Jason's attention to a toxic dump in the ocean. When Jason is reprimanded for leaving an important project, it is up to Lee, Brett, Froggy and Zoe to prove to Commander Lucas that the dumping of waste in the ocean is occurring.
Jason agrees to show Neri his and Jason's home on ORCA. After stealing one of Vanessa's uniforms and obtaining a fake ID from Froggy, Brett begins a long-winded tour of ORCA that he hopes will bore Neri into making her visit a short one.
As the kids are preparing for their shore leave to Port Douglas, Neri makes a surprise visit that forces Jason and Brett to take her with them. Damien invites Neri to see a movie but the experience frightens her and she runs off.
New monitoring equipment allows Dianne and Winston to hear Neri's communications with Charlie, but when the tag on Charlie stops working, Dianne must go out and replace it.
The spy takes the stolen whale recordings back to Dr. Hellegren at UBRI--Hellegren wants to be the first person to communicate with whales. Dianne's tests on Neri reveal a remarkable telepathic ability.
Jason and Brett round up their friends to help rescue Charlie, but Jason must also tell them the truth about Neri. Dianne destroys all of her research on Neri after Commander Lucas tells her that he will have to file a report on Neri.
