Venom fights Vengence for like a page...maybe two. Most of the series involves Venom and Vengence teaming up to stop these 4 guys who have some sort of robotic parasite taking them over (it gives them power but takes away their humanity)
Venom's 2 ladies get kidnapped so Vengence and Venom track the guys down to rescue the ladies. Then the 4 guys play a "game" where they hunt Venom and Vengence.
Venom and Vengence kick the crap outta the guys and save the day by the end of the series.
It's a good comic series, i would recommend it if you are a Venom collector. I really like the 1st issues's cover. It's got a nice red-metallic look to it.