According to Gwar mythos, Beefcake originates from the planet Cholesterol (where he met singer Oderus Urungus).

However by the time Gwar's first album Hell-O had been released, the roles had switched, and Beefcake became the permanent bass player.

Bishop played the role until after the 1993 Halloween mini-tour (after recording This Toilet Earth, which would be released in January 1994).

On April 15, 2008, Casey Orr officially announced his return to the band, donning the armor of Beefcake the Mighty once more.

He was crude even to Oderus (as indicated in the dialogue between the two in "Dawn of the Day of the Night of the Penguins," between "Horror of Yig" and "Hate Love Songs").

Little is known about Todd Evans' take on Beefcake, though his entries in the Gwar.net blog again reflect extreme arrogance ("Feast on the limitless knowledge that your puny, under-developed mind craves...and feel free to ask what you will, you just may warrant a reply, but probably not so don't hold your breath!").

On August 2, 2011, Casey Orr, once again, officially announced his amicable departure from Gwar and expressed his desire to pursue other projects.

He is the most frequent vocalist in Gwar, after Oderus, having sung lead on "Cool Place to Park", "The Road Behind", "Pussy Planet", "Jack the World" (during the chorus), "Eat Steel", "Bad Bad Men" (during the chorus, and also the "Yeehaw" at the beginning) "Fight", (by Bishop) "Crush, Kill, Destroy", "Hate Love Songs" (by Orr, originally slated to be performed by Mike Derks, who wrote the song), "The Bonus Plan" (by Evans), "Metal Metal Land", "The Price of Peace" and "Beat You to Death" (the latter two also by Orr).