Zachary Thomas "Zach" Hadel (Born: March 4, 1993 [age 23]better known online as psychicpebbles. Around the time of Hellbenders creation, Hadel would join the multimedia group SleepyCabin. The group, made up of other Flash animators, voice actors, and artists. The group consisted of Hadel, OneyNG, StamperTV, Ricepirate, Spazkid, Niall Murray, and JohnnyUtah. The group was primarily known for their podcast, the SleepyCast, where the group would discuss random topics and take fan questions for an hour to two hours, that started in late 2014. As of 2019, SleepyCabin as a collective has dissolved, but the members still occasionally record podcasts when given the opportunity.

Christopher Luke "Chris" O'Neill (born: November 21, 1990 [age 26]), better known online as OneyPlays (also known as OneyNG and Oney). In the middle of Chris's career, was one of the handful of hosts for the YouTube podcast known as "SleepyCabin." Here he and his fellow hosts shared many tales of their past and of their everyday lives. They also made up their own stories, characters, and hypotheticals. On this show, both Chris and his friend Niall were known for telling stories that were known as, "Irish Stories." This channel, along with everyone's involvement, ended on the final episode, which aired on March 24, 2019.

Cory (born September 7, 1990 [age 26]), known online as Cory Spazkid, Spazkid. Cory moved to Philadelphia in his early-to-mid 20's to be closer to several associates he had met on Newgrounds, creating a collective named SleepyCabin. In collaboration with other popular internet animators such as OneyNG and PsychicPebbles, Cory was one of the main hosts of the podcast known as "SleepyCast". Here he shared various humorous stories that were either recent or from his childhood, sharing his many opinions on internet culture and daily inconveniences