Dr. Shroob

Dr. Shroobs are yellow Shroobs that wear thick, swirly glasses in Mario & Luigi: Partners in Time. During the Shroob invasion of the Mushroom Kingdom, Dr. Shroobs were stationed in the Vim Factory, allowing them to monitor the factory's vim transformation process.

In battle, Dr. Shroobs attack with a ray gun (just like a regular Shroob). The energy blasts can be jumped over. Dr. Shroobs also use two items in battle: red Mushrooms and gray Mushrooms. The red Mushrooms make Dr. Shroob gigantic, while gray Mushrooms make Dr. Shroob tiny. After eating a Mushroom (regardless of color), the Dr. Shroob then attacks by charging into its opponent, inflicting more damage if big or less damage if small. Regardless of size, a Dr. Shroob's charge attack can be countered with a Hammer. Additionally, a Dr. Shroob holds its Mushroom for a turn before using the item. As such, if Dr. Shroob is attacked while holding a mushroom, it drops the item.

Trivia

 * During the battle with Swiggler, the four Mario Bros. are awarded Experience Points and Coins for every Dr. Shroob that is defeated, meaning the player can delay the end of the fight to boost their coffers and increase their experiences levels.