The Brain Tumor

Vincent Kennedy McMahon (/məkˈmæn/; born August 24, 1945) is an American professional wrestler. Since taking over the company from his father in the 1980s, he worked in the corporate area of the WWF and behind the scenes. In 1998, he shocked the world by leaving the WWF empire he built to join the World of Marc Mero America, where he works as the Brain Tumor.

As Vince McMahon (1998)
Vince McMahon was a coke fiend. He participated in the Battle for Supremacy tournament, facing Ian Rotten. After being defeated in the first round by Rotten, he started shaking and crying and demanding that Rotten give him a couple ounces of cocaine. Rotten denied, as only he gets to ingest hard drugs.

Seeing as how he couldn't defeat one of the biggest druggies in the business, he turned to another legend: New Jack the Ripper. At Xtreme Rulez, he failed to defeat the Ripper.

He wouldn't compete at Future So Bright, but he was involved outside the ring. He started the show off by talking about Hiroshima Nagasaki, and after a while Ian Rotten demanded that Vince give him ICO-PRO. After this, we strangely never saw Vince McMahon again.

As The Brain Tumor (1998-)
At Future So Bright, an old foe of Jushin Liger came out to play once again. A giant, 6'2 tumor grew out of Liger's head and started to beat him down. This led to a match at the show, where the Tumor beat Liger easily. This lead to the timely death of Luger forever.

The Jushin Liger Tribute Show featured an appearance from the Tumor. Marc Mero was able to see the ghost of Liger, who was fighting the Tumor still. The Tumor once again defeated Liger in a wrestling match. Soon enough, he would be freed from Liger's corpse thanks to a precise cut from Chainsaw Charlie. Having defeated Liger twice, the physical embodiment of cancer set his sights on Mero.

The Brain Tumor would challenge Marc Mero for his respect at Trigger Happy Havoc. Despite being the one truly unbeatable disease, Marc Mero showed that he is so powerful that he can cure cancer once and for all by defeating the Brain Tumor in front of 447 screaming Meromaniacs.

At the Get Us To Japan Fundraiser, the Tumor used the death of his best friend Liger to drum up support for the company. This saddened the Tumor so much that when he went to Japan at Fly Me To The Sun, he went to the Aokigahara suicide forest and found Liger's body. He stole it and used it to defeat Them Mero Boys.