Professor Gizmo

Professor Gizmo is a scientist who starred in some episodes of The Ruff and Reddy Show, ever since then, he has gone on to make some other guest appearances. He is voiced by Don Messick.

TV series

 * Ruff and Reddy
 * 1.7 Muni Mula Mix Up
 * 1.8 Creepy Creature Feature
 * 1.9 The Creepy Creature
 * 1.10 Surprise in the Skies
 * 1.11 Crowds In The Clouds
 * 1.12 Reddy's Rocket Rescue
 * 1.13 Rocket Ranger Danger
 * 1.42 The Metal Monster Mystery
 * 1.43 The Late, Late Pieces of Eight
 * 1.44 The Goon of Doubloon Lagoon
 * 1.45 Two Dubs in a Sub
 * 1.46 Big Deal with a Small Seal
 * 1.47 A Real Keen Submarine
 * 1.48 No Hope for a Dope on a Periscope
 * 1.49 Rescue in the Deep Blue
 * 1.50 A Whale of a Tale of a Tail of a Whale
 * 1.51 Welcome Guest in a Treasure Chest
 * 1.52 Pot Shot Puts Hot Shot on a Hot Spot
 * 2.1 Egg Yeggs
 * 2.2 The Dummy Mummy
 * 2.3 The Chickenhearted Chickosaurus Chase
 * 2.4 The Chickasaurus Crack-Up
 * 2.5 The Slick Chickasaurus Chick Trick
 * 2.6 The Chicken-Hearted Chickasaurus
 * 2.7 Chickasaurus Choo Choo!
 * 2.8 Rumble in the Jungle
 * 2.9 The Sorehead Tyrannosaurus
 * 2.10 Two Eyes Spy on the Guys
 * Wacky Races (2017)
 * 2.11 The Wacky Always Races Twice

Comics

 * The Funtastic World of Hanna-Barbera
 * #3 "The Man Who Stole Thursday"

Books

 * Ruff and Reddy (A Little Golden Book)

Wacky Races (2017) cameo
In the episode "The Wacky Always Races Twice" he played the role as one of the "Low Lives" that Penelope Pitstop had to avoid.

Thursdays are missing!
He built a time traveling device called "Chronocycle", which Tempus ended up stealing, and removing Thursday's with. He later helped Blue Falcon get the Yogi's and Rottens out of Stone Age.