Who's Scooby-Doo? is the first part of the fifth episode of The Scooby & Scrappy Doo Puppy Hour.
The guys enter their Super Pizza Maker in the Teenage Science Fair, but someone else has entered a Personality Changer, and Shaggy and Scooby's personalities get switched and then two bullies steal the machine.
At a teen science center, the Shaggy and Scooby try out their super pizza maker. They get sucked into it and tossed into another kid's experiment, a personality switcher, which switches their personalities.
A couple of bullies Tank and Squeak watch, and figuring it is worth money, promptly swipe it from behind a curtain, before Scrappy has the chance to change Shaggy and Scooby back. They see the bullies take off in a car, and they pursue in the Mystery Machine. Scooby (in Shaggy's body) drives, reasoning that he has a "license" (dog license, that is). The bullies spill oil on the road, and the gang spins out of control. Shaggy (in Scooby's body) now drives.
A malt shop is the bullies' hangout. As they try to figure out how the device works, the gang hides under the table. The bullies hear them, and as Scooby reaches, Tank replaces the contraption with a cat, who Scooby (Shaggy's body) now chases.
Next, they disguise as a waiter and take their orders. The bullies soon see four arms and chase them. Scooby has the device and drops it, and it begins switching both Scooby and Shaggy's personalities with Tank and Squeak. ("This is getting confusing") Scrappy grabs it and switches them around some more.
Shaggy, back to his normal self, mistakenly thinks Scooby is as well, and runs faster when he discovers it's still one of the bullies. They grab onto a chandelier and all four wind up as a giant sundae. Scrappy changes everyone back to normal, and the bullies flee. Shaggy teases Scooby by saying "Scooby Dooby Doo!"
- Cat (single appearance)(no lines)
- Teen Science Fair
- Malt Shop
- Super Pizza Maker
- Personality Switcher
- The Mystery Machine
- Tank and Squeak's car
|Don Messick|| Scooby-Doo|
|Casey Kasem||Shaggy Rogers|
Animation mistakes and/or technical glitches
- None known.
Inconsistencies/continuity errors and/or goofs/oddities
- None known.
In other languages
|Greek||Ποιος είναι Ποιος||Who's Who?|
- Scooby-Doo! 13 Spooky Tales: Ruh-Roh Robot! DVD set released by Warner Home Video on September 24, 2013.