Dubay and Nino bring Thriller to an end with issue 12 (Nov 84), and we can all celebrate this. Well, I know I can, at least.
Thriller and the Seven Seconds spend the issue working to avert a nuclear war (again), which the digital newscaster wants to create. For a while it looks like the team is getting killed off while trying to do so. Both Data and Crackerjack appear to get killed, or be dying, but they aren't. Rats.
The team exposes the newscaster as a computer program with a digital image, and so people stop believing what he is telling them.
There is more to it than that, but in the broad strokes, that's the plot of this issue. If you want to know more, dig out these issues and subject yourselves to them. Now I know why Thriller had such a short run and was never revived in any fashion. And why everyone I asked about it, who had read it, told me it was crap.