Dr. Shrinky (currently known as Dr. Grow) is a supervillain played by Tyrone. He works with Yucky Man and is able to shrink things and people.
Dr. Shrinky is primarily orange. He wears a medical scrub cap, a teal shirt embellished with a shrink symbol, and teal tights. He also wears a black mask, boots and gloves.
Tyrone has played Dr. Shrinky in one episode of The Backyardigans: "Race to the Tower of Power" from season one. He reprises this role in the Nintendo DS game.