Grumble Bee was a bee monster created by Finster afterRita Repulsa saw Billy's rage over getting a B on a science test. Grumble Bee was too powerful for Blue Ranger to handle alone, so Yellow Ranger came to her friend's aid. Grumble Bee could shoot greenish-yellow venom which could eat through anything, including the Blue Ranger's suit. He also had vibrating wings that could send yellow pulses of energy through the air that would hurt the ears of anyone who heard the ultra-sonic sound. Later he grows giant, and was defeated by the Megazord's Power Sword. Grumble Bee
During the Rangers' battle with Trumpet Top, that monster summoned up an illusory image of Grumble Bee along with other monsters. Orchestral Maneuvers in the Park
Grumble Bee later resurfaced as a guest at Rita and Zedd's wedding, and apparently hit on the Invenusable Fly Trapduring the celebration. Soon after, he was also one of the 6 monsters in the showdown against the team of the Thunder Megazord and White Tigerzord. He was defeated by the White Tigerzord. The Wedding
- Grumble Bee comes from what is commonly referred to as "Zyu2" footage, and was not seen in the original Zyuranger.
- A recoloring of the Grumble Bee costume was reused for Waspicable, in Power Rangers in Space.