The Venture Bros.: Radiant Is the Blood of the Baboon Heart

The Monarch is revealed to be a genetically engineered clone created to help his parents conceive due to infertility issues. The cloning procedure went wrong when baboon DNA was accidentally introduced, which is why he has baboon-like traits and behaviors. This explains his lifelong obsession with Dr. Venture, not as a sibling rivalry, but as a mistaken vendetta based on false assumptions about their relationship.

The Monarch's irrational hatred of Dr. Venture and his primate-like mannerisms were hints throughout the series.

Mantilla's mother is Bobbi St. Simone. She had a brief romantic encounter with Force Majeure (one of Jonas Venture's characters), which resulted in Mantilla's birth. Bobbi was later recruited by O.S.I. as a double agent and went into hiding to protect her daughter after The Sovereign murdered her in a power grab.

Dean was bitten by one of the blaculas in Chicago while trying to protect Jefferson Twilight. However, the injury was not a typical vampire bite, Jefferson actually tackled Dean to shield him, accidentally leaving his tooth necklace embedded in Dean's arm. Jefferson later clarified this when Dean finally confessed about the bite.

Elige Tua is Latin for 'choose your family.' The watch was a gift from Jonas Venture given to Hank through Ben. The inscription reflects the film's central theme that family is defined by love and commitment rather than shared DNA, which is reinforced by the revelations about The Monarch's clone origin and Mantilla's true relationship with the Venture brothers.

Dr. Venture passed his mother's unique invisibility ability to Mantilla as payment for a priceless legacy, the fertilized eggs that would later become Hank and Dean. This makes Mantilla their biological mother, though she never raised them. The revelation comes when Dr. Mrs. The Monarch discovers Mantilla's pregnancy and confronts her about their shared bloodline.

Dr. Venture's history of passing his genetic abilities to others was established earlier in the series.

The Council of Thirteen discovered a DNA link connecting Hank Venture to the Guild through his initiation, suggesting he may be related to Guild members. This revelation prompted the Council to issue a directive forbidding any action against Dr. Venture until they could definitively establish their familial ties, putting all vendettas on hold.

During The Monarch and 21's heist at VenTech Tower, Mantilla hacked into the HelperPods using 21's phone. She turned the devices' existing floating glitch against them, causing them to spin out of control and send the tower into an unstable orbit. Mantilla later used her newly acquired invisibility powers to shut down the HelperPods entirely, triggering the tower's descent toward Earth.

Dr. Venture's frustration with the HelperPod bug that made them float and play tunes was established earlier.

Orpheus entered purgatory to rescue Hank, who had been drawn there after a head injury. Dean had also arrived accidentally while trying to save his brother. Orpheus saved both brothers from Jonas Venture's fictional characters who were targeting them in the afterlife, leading to a long-awaited reconciliation between the brothers.

Hank's repeated visits to purgatory were hinted at throughout his character arc.

The title refers to The Monarch's origin as a genetically engineered clone with accidental baboon DNA. This baboon genetic material was introduced during the cloning procedure meant to help his infertile parents conceive, giving The Monarch his distinctive personality traits and appearance. The film reveals this truth after Dr. Venture saves his life with a blood transfusion.

After The Monarch was impaled by the Jonas Venture statue during the tower crash, Ben arrived with critical thinking that saved him. He performed an emergency blood transfusion using Dr. Venture's blood, which coincidentally confirmed the clone revelation about their lack of true biological relationship. The Monarch survived but maintained his defiance, swearing to continue his feud.