Sonic Cookie Eggman is physically the same in appearance compared to his normal form, although his entire body, including his clothing, takes on a blue color reminiscent to that of Sonic's fur.
After Sonic forcibly fed Dr. Eggman an Evil Cookie with his own DNA in it, Eggman transformed into Sonic Cookie Eggman. Sonic Cookie Eggman held off Sonic's friends long enough for Sonic to return with scraps of DNA from each of his friends to return them back to normal. Afterwards, Sonic Cookie Eggman commented on how it was great that they could now fight side by side. However, Sticks the Badger tossed an Evil Cookie with Eggman's DNA in his mouth, returning the doctor to normal.
Outside of Sonic's regular combat skills, Sonic Cookie Eggman also takes on the personality of Sonic, becoming more upbeat, sassy, and cheery.
Powers and abilities
Due to having been imbued with Sonic's DNA, Sonic Cookie Eggman possesses virtually all of Sonic's abilities, including his super speed, fast reflexes, hand-to-hand combat skills and spin attack.
- This is the first named transformation to appear in the Sonic Boom series.