Uncle Grandpa (2013)

S5E23 Uncle Grandpa: The High School Years

In the series finale, we see a flashback of the gang during their high school days. Uncle Grandpa, Pizza Steve, Mr. Gus, Tiger, Frankenstein, and Belly Bag find themselves stuck in detention. With the principal away in the bathroom, they seek ways to pass the time, gradually forming a bond. After a brief altercation, they reconcile, and Uncle Grandpa proposes that they live together and embark on exciting adventures in the RV.