|The Energy Monster|
|Name||The Energy Monster|
|Family||The Birthday Girl (temporary owner)|
|Abilities||Consuming sources of electricity; shocking people, throwing bolts of energy|
|Voice Actor||Maria Bamford (Dinner or Consequences)|
When the Energy Monster is low on energy, her size shrinks to a miniscule electric creature that is easier to contain than its larger, powered-up form. However, the only way of reducing her size is to "short-circuit" it by drenching it in water (or glass dust, as shown in "Oh, Holiday Cheese"), or if continuous electrical attacks drain most of her energy. It has also been shown that the Energy Monster is not only drawn to large sources of power (such as electronics stores or generators), but is also attracted to shiny things (such as Violet's shimmering hat or the disco ball in "Becky and the Bard").
In the episode "Dinner or Consequences", Doctor Two-Brains made a helmet to harness the Energy Monster's power for his cheese ray. But when the Energy Monster put on the helmet, she started talking. It is at this point that the Energy Monster reveals that she is a girl and that her preferred name is Maria. In fact, she started talking about everything, savoring every bit of her ability. When the helmet is confiscated later, the Energy Monster is disappointed, and yearns to find her voice helmet again. Eventually Doctor Two-Brains becomes fed up with her over-talkativeness, so he damaged the helmet so she couldn't talk again.