I was kind of annoyed by the upcoming Venom crossover since i'm only reading the Red Hulk book and i didn't want to get the other books or read part 3 of a 4 part story in Hulk. Luckily, as i was reading Paul O'Brien's reviews for the week, i saw this:

In the interests of completism, I'd better say something about the "Circle of Four" storyline running through this month's weekly Venom issues, oddly numbered as issues #13.1 to #13.4. This storyline appears to have started life as a planned crossover between Venom, X-23, Ghost Rider and Hulk, only to be thwarted when half of those books were cancelled. Now it's been reassigned as a Venom storyline with a whole load of guest stars.

Works for me.