Professor Pickle (ピックル教授 Pikkuru Kyōju) is a supporting character in Sonic Unleashed. He is a human academic based at Spagonia University and a world-renowned scholar and expert in ancient literature. When Dr. Eggman sought the power of Dark Gaia, Pickle was kidnapped and had his research stolen by Eggman due to his knowledge on the creature, but was freed by Sonic the Hedgehog, Tails and Chip. Pickle then assisted Sonic and his friends in their mission to put the earth back together after it had been shattered by Dark Gaia by guiding them to the Gaia Temples.