Venom 2099
Kron Stone, in the year 2099, half-brother to that era's Spider-Man, bonded with the symbiote to become Venom. The symbiote was described as having mutated over the years, and displayed new abilities in this timeline, including acidic blood and saliva. It was revealed that the symbiote bonded with Kron on a molecular level giving Kron an amorphous physiology that allowed his body to take on the properties of the symbiote itself.
Varient covers of these issues were printed under the Venom 2099 title.