Trevor Henderson

Trevor Henderson (born April 11, 1986) is a Canadian illustrator, concept designer, and writer who rose to fame in the late 2010s through his work on Instagram. He is best known for his creatures such as Siren Head, Cartoon Cat and Long Horse. He also wrote the teen horror duology Scarewaves, and in the fall of 2022, he created the horror podcast Mayfair Watchers Society, becoming its chief creative director and mastermind.

Career Henderson was born in Toronto, Canada, on April 11, 1986. He currently resides in Toronto, where he actively pursues creative pursuits and posts his work on Instagram. Trevor Henderson graduated from the OCAD University.

His early work in 2012 was in the acid body horror style, from which he moved on to his own recognizable style.

When he started his artistic journey in 2018, Trevor Henderson says he drew monsters every day using photos people sent him online. Until 2020, Trevor combined painting and working in retail. According to the artist, his last attempt was at a bookstore, which he left two months before the start of COVID-19 pandemic, to completely switch to freelancing. Henderson's illustration work has garnered recognition in leading national media outlets; in 2024, The New York Times singled out his artwork for the horror novella Stay on the Line.

Siren Head One of Henderson's most recognizable characters, Siren Head, was created in August 2018. The creature's main concept was a cryptid embodying the numbers station phenomenon, which was of great interest to the artist at the time. It wasn't until April 2020 that a video of a giant Siren Head towering over a city went viral on social media. Some time later, the 2018 game was later spotted and quickly picked up by video bloggers.

Cartoon Cat Cartoon Cat first appeared on Trevor Henderson's Instagram in August 2018, as a rubber hose style cartoon with large eyes, a toothy grin, and long limbs. Cartoon Cat is an ancient hollow rot that uses the collective human awareness and memories of old cartoons as a passageway to manifest into reality and wreak havoc. It is depicted in abandoned places such as malls. It has the ability to shape shift, and has cartoon physics.

On July 13, 2026, it was announced that TriStar Pictures had acquired feature film rights to Cartoon Cat, marking Henderson's second feature deal after Siren Head.