Albert Shaggleford

Dr. Albert Shaggleford is a billionaire scientist and the maternal uncle of Shaggy Rogers.

Season one
After mysteriously disappearing, he left Shaggy all his wealth and his mansion. Shaggy and Scooby-Doo discover his secret lab hiding his nano technology research, and begin investigating. (Shags To Riches)

Season two
It was discovered that Albert hid in plain sight, joining his enemy Dr Phineas Phibes in disguise as Dr. Trebla. (Uncle Albert Alert)