In the main Marvel Comics universe, Toxin is the offspring of Carnage, who felt nothing but disdain for his “son” and resolved to kill him right as he was born. Venom, Carnage’s own “father,” was determined to protect Toxin, but once the new symbiote was born, Carnage bonded him to Detective Patrick Mulligan, who was struggling in both his professional and personal lives. Carnage thought that by bonding Toxin with a host after he was born, it would be a piece of cake killing the newborn. Luckily, Venom swooped in to save his “grandson” from being murdered, and eventually Toxin matured enough to manifest itself as a “costume” around Mulligan.
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