Galaximus

"Greetings, Locked Room Gang. I am your future ruler, and ruler of the entire universe. I have watched your struggles in secret from Season 1 right up to as we speak. Don't let any other villain fool you- I'M the boss here. You can never defeat me. My sister, stupid squid, has defied me. For this I will KILL her. And no one else will fare better. I'm waiting until you screw up, and make my move. I will dispose of you soon, fools! BWAHAHAHAHAHA!"

- Galaximus

Galaximus is an antagonist in the In a Locked Room series. She is Jenny's sister, and is bent on ruling the Milky Way Galaxy, and the entire universe. Since childhood, she has harassed her little sister, and after an incident, she has sworn revenge on Jenny. She is now on the verge of ruling Earth, but she also wants to make sure The Locked Room Gang never escapes. She currently is not allied with other villains, and she will let nothing stop her from killing her sister.

History
Galaximus first appeared in Royal Rainbow Road. When she appears, she insults Jenny, and the other members of the gang. She quickly departs, but warns she will attack them someday.

Backstory
As a child, Galaximus was known as Sheila. She was the only child of her family until Jenny was born two months later. She always teased her younger sister, and when she turned 14, she used her squid form to pester her further. However, one day Jenny got her revenge by spreading a rumor that Sheila was an Octarian in disguise. Sheila was then banished from Inkopolis. She swore revenge on her sister, Two years later, Jenny, now 14, tried to stop her, but Sheila kicked her aside and proceeded to overthrow the solar system. She vowed to kill Jenny, regardless of the circumstances. Within a few months, Earth was the only planet she had yet to overcome. Mysteriously, she has watched the Locked Room Gang since the beginning, but it was when Jenny joined that she vowed to destroy them.

Trivia

 * She looks like a regular Inkling, but she is capable of transformation.
 * Unlike Jenny, she can also grow herself.
 * She kept a low profile for many episodes, until finally revealing herself.
 * Her name is a combination of the words "galaxy" and "Maximus"