Professor Greer is a friend of Velma Dinkley's.
Physical appearance
Insert details here.
Personality
He is very clever at science and learning about animals, formulas, etc. He is probably allergic to flowers (he was the Mantis and it sneezed from the flowers).
History
The Scooby-Doo Show
Season three
He secretly dressed up as the praying mantis creature as he wished to scare competion away until his purchase of the gardens was finalised; because he had discovered oil on the property.