Garrett Bobby Ferguson

Garrett Bobby Ferguson, Sr. (G.B.F.), also incorrectly referred to as Giant Bearded Face or Giant Beardo Face, is the main antagonist who appears in the episode "High Score" and is from outer space. He was also the universe record holder for an arcade game called Broken Bonez. That is, until he was dethroned by Mordecai and Rigby which caused him to die in an explosion of goo. He is a parody of the world renowned videogame highscore champion Billy Mitchell, who currently holds the record for playing a perfect game of Pac-Man. Garrett also appeared in Video Game Wizard, but as a bronze statue. The Ferguson Convention Center is highly probable that it was made due to him, since he was known to be extremely talented at video games.

However, his son, Garrett Bobby Ferguson Jr., later destroys the park to create "Exit 9B" to revive all villains from the past episodes, including his father. But after the gang team up with the help of numerous allies, G.B.F. is eventually sent back into the portal with the other villains.

Mordecai
Mordecai Is Garrett Bobby Ferguson's Rival Since "High Score"

Rigby
Rigby is also Garrett Bobby Ferguson's Rival since "High Score "

Garrett Bobby Ferguson Jr.
Garrett Bobby Ferguson Jr. Is Garrett Bobby Ferguson's Son

Appearance
G.B.F. appears to be a floating head with long, brown hair, and a beard, who can grow arms, and legs. His face closely resembles that of Billy Mitchell, an electronic sports player whom has been claimed by some as the, "greatest arcade-video-game player of all time" for achieving the first perfect score in Pac Man.

Trivia

 * He could have owned the Ferguson Convention Center before he died.
 * He is nicknamed "Giant Bearded Face" by Mordecai and Rigby and "Giant Beardo Face" by Mordecai, since his initials are GBF.
 * In "Yes Dude Yes", Mordecai said to CJ, "...his head just exploded, like, blam!" He is most likely talking about GBF.(Garrett Bobby Ferguson)