Professor Sprout was the professor who invented the Sprout-O-Matic and gave the prototype to Ratchet on planet Ryllus because he "helped" him with the final test. He appeared to be obsessed with plants and even had one growing out of the top of his head. The professor was a very short man who wore glasses and a lab coat like most professors in the Solana Galaxy and Bogon Galaxy, and had very large green ears. He was last seen getting startled by a pirahna plant he made (which ate Ratchet earlier) and was eaten alive by the carnivorous plant.
- Ratchet & Clank: Size Matters (first appearance)