End of the line for you. You're the grass and I'm the lawnmower.
~ The Master Cylinder

The Master Cylinder is an evil robot who appeared as a major antagonist in the 1960 Felix the Cat cartoon "Master Cylinder - Master of the Moon" (where is calls himself "King of the Moon") and he first appeared in Joe Oriolo's 1959 revival of Felix the Cat, he would then proceed to become one of Felix's main enemies throughout the series: unlike the Professor, Master Cylinder was never helpful nor friendly to Felix in any of his appearances and remained villainous (while The Professor often switched between the role of an antagonist and an uneasy ally).

He was voiced by the late Jack Mercer, and later John Stocker.

The robot gained its name from its shape (which resembled a cylinder) and was the secondary antagonist in Felix the Cat: The Movie in which it was revealed that Master Cylinder was a creation of the Duke of Zill and the most powerful of the Cylinder robots - Master Cylinder would proceed to make a brief appearance in the movie when The Duke unleashed an updated version of the robot in an effort to destroy the heroes.

However, Felix, deciding that the Cylinder was too dangerous to be kept alive, acted quickly and threw a magic tome known as the Book of Oriana which saved Felix and his friends, at Master Cylinder, causing the robot to explode and seemingly destroying his old enemy once and for all.



  • In his debut episode, Master Cylinder describes himself as a disembodied brain contained within an electromechanical body.
  • The Master Cylinder had a minion, to be seen in later episodes, and that minion is a helmeted white squid named General Klaang.
  • His body build resembles a battery.
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