Following the destruction of a WASP submarine, Troy and Phones are sent to investigate. They are soon captured by an enemy submarine in the form of a gigantic fish, which takes them to the underwater city Titanica. There, they meet Titan for the first time.

Commander Shore's friend Admiral Denver claims to have seen the Loch Ness Monster. As a result, the Stingray crew travel to Scotland to see if the legendary beast exists.

Thinking all the commotion at Marineville signals the visit of a VIP, X20 kidnaps the man and delivers him to Titan. The undersea ruler is surprised to learn that X20 has brought Duke Dexter, a pop singer. Titan is convinced that Dexter is an ally of the underwater people by the way he drives the Terraneans crazy with the weird noises he emits. Dexter is freed by Titan to continue his 'good work'.

While the Stingray crew are on shore leave in Casablanca, a merchant sells Phones a map leading to ancient treasure. However, when Troy refuses to search for it, Marina secretly alters Stingray's course.

A film crew arrive at Marineville to make a movie on Stingray. Everyone will play themselves except Troy, who is to be replaced by an actor. What's worse is that the director is in fact Surface Agent X20 who has a plan to kill Troy !!

As part of his plan to destroy Marineville, Surface Agent X20 infiltrates the base by posing as a professor who can teach mute people to speak. Then, unknowingly, Troy and Phones place Marina in his hands.

After receiveing the 'Aquanaut of the Year' award, Troy is surprised to find himself the subject of 'This Is Your Life'. His most exciting adventures are re-capped in flashback before the interviewer pops the important question - are he and Atlanta more than just good friends? Before he can answer an alert is sounded, leaving Atlanta to assure the interviewer that there isn't enough time for romance in the WASPs!