The adventures of Uncle Grandpa who is out to help every child and adult in the world through the power of imagination. With his mystical R.V. and eternal optimism, Uncle Grandpa is always ready to greet the day - and … Peter Browngardt, Eric Bauza, Kevin Michael Richardson, Adam DeVine, Tom Kenny, Audie Harrison, Jarid Root Added on HBO 2023-01-22. Added on Hulu 2022-03-29, leaving 2024-10-01. Youtube Trailer