The Big Brain (Teenage Zombies: Invasion Of The Alien Brain Thingys)

"I chortle at man's weakness! Feel the wrath of my mighty brain armies! My voice is destruction!"

- The Big Brain to the humans of Earth as he's conquering it. The Big Brain is the main antagonist of the 2008 Nintendo DS Comedy/Puzzle/Platform video game Teenage Zombies: Invasion of the Alien Brain Thingys!

Biography
The Big Brain was the leader of an alien race simply known as The Brains who would travel from planet to planet and eaither destroy it completely or enslave every living thing on it for their armies, then collect a souvenir snow globe for his collection, of which he had countless. However, once he arrived to earth and began killing/enslaving all the humans and animals, the teenage zombies awoke from their graves at the smell of brains.

Everything The Big Brain tried to do to stop or even slow down the teenage zombies did nothing as his alien technology was useless. They were immune to mind control, laser beams were ineffective, and they were oblivious to peer pressure and bravado.

Eventually, the teenage zombies reached The Big Brain's headquarters and began chasing him down but he managed to get to an escape pod on his spaceship and fly off into space, never to be seen or heard from again, and ending his reign of terror.

Personality
Despite being a giant brain, The Big Brain is usually shown to be quite dim-witted when compared to his right hand man, No. 1. When he was first told about the teenage zombies destroying and eating his army, he thought they were a band he had an album for and forgets No. 1 was even talking to him. The Big Brain would regularly insult and berate No. 1 for his own amusement,  calling him "No One" as a pun on his name. He would also not invite him to staff parties even though No. 1 is his second in command. The Big Brain was incredibly egotistical and self-centered, giving himself many nicknames and praise for the work others did, mostly No. 1. Near the end of the game, The Big Brain was revealed to be a massive coward when the teenage zombies were getting close to him after destroying his armies and instead of trying to fight them off since he was much bigger than all three of them, he flew off into space, giving up on destroying Earth.