"There's an evil monkey in my closet!"

[TheGLIVEN]

How many times has the evil monkey appeared in Family Guy?

[Speedy Boris]

Once in "Fore Father" and once in "Ready, Willing and Disabled", where they reveal how he became an evil monkey. That's all I know, though there might be a couple more.

[Chrono1995]

I definitely remember him showing up in "Emission Impossible."

[Yash]

Once in "Fore Father" and once in "Ready, Willing and Disabled", where they reveal how he became an evil monkey. That's all I know, though there might be a couple more.
The revelation was the funniest thing in Family Guy EVER... except for the Kool-Aid Man in the first ep...

I think he's in "I Am Peter, Hear Me Roar", but I'm not sure.

[Bubblegum Girl]

except for the Kool-Aid Man in the first ep...
It was the timing that made it so perfect. :D

"Oh no!"
"Oh no!"
"Oh no!"
"Oh no!"
"Oh Yeah!"