* A sweet girl and her lover on a Caribbean cruise. He just happens to be a member of an LAPD SWAT team.

* The other passengers on the cruise, who just happen to include members of a diamond dealers' association, who have filled the ship's vault with treasure.

* The villain's plot to hijack and destroy the ship, steal the diamonds, and get revenge on the computer company whose ``electromagnetic fields gave me copper poisoning,'' after which he was fired and cast aside.

All of these pleasures, and more, are in "Speed 2: Cruise Control,'' which is a sequel to "Speed" in name only--since even the basic premise is different.

In the first movie, if the bus stopped, everyone would get killed. In this one, if the ocean liner doesn't stop, everyone will get killed. It's a small twist, I grant you, but a decisive one.

The movie stars Sandra Bullock, from "Speed", and Jason Patric as her boyfriend. (The dialogue explains that she split up with the Keanu Reeves character from the earlier film for a lot of reasons, one of them possibly being that he did not want to appear in the sequel). They go on a cruise, and are unlucky enough to pick the boat targeted for revenge by a villain named Geiger (Willem Dafoe), whose laptop computers can take over the ship's own systems and control them.

Bullock plays the same fetching character she played the first time: warm, likable, stuttering a little, calm under pressure. Unfortunately, considering that she was crucial to the success of "Speed", the screenplay gives her a secondary role and hands most of the best scenes to Patric, who handles them like a traditional action hero. At one point he puts on scuba gear and dangles inches from the giant spinning props of the ocean liner, and at another point he shoots a seaplane with a spear-gun and reels himself in. These stunts make the original "Speed" look plausible.