The robot has all the girls' fighting styles and also has an arsenal of many weapons including missiles and a bow that can be used as a pair of scissors, and it can curl up into a ball for defense. Dynamo made its first appearance in "Uh Oh Dynamo".
After the girls defeated an incredibly strong monster, the Professor's overprotective parenting skills kick in. As a result, he created Dynamo to help the girls defeat monsters. Though the girls were reluctant to use it, they eventually did so when the Professor threatened to ground the girls if they didn't use Dynamo. Though the monster was defeated, the Dynamo itself did extensive damage to the city, leading the Mayor to demand they never use it again. Despite this, the Professor didn't dismantle it, possibly out of setiment, though as shown in "Oops, I Did It Again", his memory of it is not that fond.
The second appearance of the Dynamo is in "Live and Let Dynamo", where it is intentionally causing the destruction of the city. As the girls fought the machine, they wondered who could possibly be in it, ruling out villain after villain as to who the pilot could be. In an ironic twist, the Dynamo's pilot was revealed to be the Mayor, totally unaware of how to use the machine.
Dynamo's appearance is a mix of the three girls. She wears a red dress with black Mary Janes. When it comes to her hairstyle, she has Buttercup's forehead slit, Bubbles' pigtails and Blossom's bow, only it is colored blue.