While in prison, Venom produces an offspring named Carnage. (He reproduces asexually, in case you were wondering.) Venom doesn't tell Eddie about it, and Venom and Eddie escape prison. Once they're gone, Carnage bonds with Cletus.
Originating as an offspring of Venom, Carnage is much more powerful than its parent symbiote because of the symbiotes' biology, and is in many ways a darker version of him.
Dylan Brock is the son of Eddie Brock and Anne Weying. When Anne bonded to the Venom symbiote, she somehow became pregnant with Dylan. He was created by the symbiotes in order to destroy their god Knull and sever him from the hive-mind.
Carnage was once a serial killer known as Cletus Kasady, and became Carnage after merging with the offspring of the alien symbiote called Venom during a prison breakout. The symbiote amplified his psychotic nature making him even less mentally stable than he had been previously, and therefore even more dangerous.
Carl Brock's appearance in Amazing Spider-Man #375 depicts him with a full head of hair, but Venom: Dark Origin and subsequent appearances depict him as a balding man with a moustache.
In nearly every iteration of Carnage's character, he is the offspring of Venom. The Klyntar, the race of aliens that the symbiotes belong to, reproduce asexually and can transmit their offspring to other hosts.
For example, Venom gave birth to seven "children", and its first child Carnage had three. senses that extend over its entire surface, enabling hosts to "see" what is behind them or otherwise not in their line of sight (like a Spider-Sense).
While in prison, Venom produces an offspring named Carnage. (He reproduces asexually, in case you were wondering.) Venom doesn't tell Eddie about it, and Venom and Eddie escape prison. Once they're gone, Carnage bonds with Cletus.
In the comics, the Venom symbiote essentially reproduced and spawned the new symbiote that bonded to Cletus and became Carnage, but in the movie Carnage is created by a twist of fate--a twist of fate that could easily be repeated if Eddie's not careful.
The movie doesn't clearly state why, but Venom is probably afraid of Carnage because Carnage doesn't have the moral restrictions that Venom does. They are alien symbiotes. This means they need another living host to bond with if they're going to survive long-term.
While Venom has had a variety of hosts since his introduction, the most iconic is Eddie Brock and one of the weirdest and most tragic Venom stories is all about how the symbiote got Eddie Brock pregnant in "The Nativity," the story that introduced the Sleeper symbiote.
The Venom Symbiote and Eddie Brock Are Pregnant.
The bond between the Carnage symbiote and Kasady was stronger than the bond between Brock and the Venom symbiote. Cletus Kasady was also a serial killer and thought of as insane. As a result, Carnage is far more violent, powerful, and deadly than Venom.
The spawn of the Venom symbiote then attached itself to Kasady through his bloodstream. Carnage achieves this by entering Kasady's body through a cut on his hand. This is the reason why Carnage appears as the colour red, as he entered through the bloodstream, which is of course red.
The original Carnage symbiote was the first offspring of the Venom symbiote, spawned when it broke Eddie Brock out of prison. The newborn symbiote bonded to serial killer Cletus Kasady, merging with his blood to become nigh-inseparable from him, and Carnage was born.
The Venom/Spider-Man feud began years ago due to bad journalism, Spider-Man's heroism, and the mutual hatred of one angry symbiote. Though the Lethal Protector has become an anti-hero since the '90s, Venom is still widely regarded as one of Spider-Man's most well-known and iconic villains.
The son of Carnage, Toxin, was believed to be the most powerful symbiote ever created. The raw power of Toxin was so great that he was feared even by the King in Black, Knull, creator and leader of the symbiotes.
His symbiote is corrupted and evolved, making Carnage even stronger than both Venom and Spider-Man.
Carnage Is Venom's Son In Marvel Comics
The two bonded after Brock sank into a deep depression that had him contemplating suicide, and while he sought solace at the church where Spider-Man repelled the symbiote, Venom sensed Brock's hatred for the web-slinger, and thus bonded with him.
Blue Symbiote (2) (Agony): In the comics Agony was one of the symbiotes forcibly spawned from Venom alongside several others by the Life Foundation.
While captive, the Venom symbiote was forced to give birth to five offspring - Riot, Lasher, Phage, Agony, and Scream - who were bonded to PMCs hired by the Life Foundation. When corrupt corporation Scarmore Inc.
Eddie BrockVenom. Bonding with an unearthly symbiote, Eddie Brock is given amazing powers and an unstable psyche.
They rapidly age the symbiotes and pair them to people: Scream (yellow, female), Agony (pink, female), Lasher (green, male), Riot (grey, male) and Phage (orange, male).
The idea that he would become stronger after eating Carnage seems to come from an idea that he would be absorbing Carnage's symbiote powers and properties into himself, therefore becoming stronger. However, unlike the mutant powers of Rogue, Venom is not absorbing Carnage but consuming him.