Bubba was introduced in the five-part episode "Time is Money". Encountered during an accidental trip into Duckburg's prehistoric past, Bubba latched onto Scrooge McDuck after Scrooge accidentally saved him from a ferocious Tyrannosaurus Rex. Bubba and his pet Triceratops Tootsie stowed away on Gyro Gearloose's time-ship, the Millennium Shortcut, which ran on a form of unstable energy called "bombastium," returning with Scrooge and crew to the present day.
He currently lives in a version of his old cave on the grounds of McDuck Manor and goes to school with Huey, Dewey and Louie and Webby.
Bubba is similar to Cave Pup from 101 Dalmatians: The Series, as both are prehistoric characters who find themselves in a modern setting, and both have similar sounding voices.