I loved that Simpsons episode. Heston did well in the late 60's and early 70's with some sci fi. I remember him running around with that silly hard hat in Soylent Green screaming Soylent Green is people. LOL.
Didn't Heston cry "Let my people go - when I am finished!" before parting the Red Sea in order to get to the Sistine Chapel so he could paint its ceiling depicting apes inheriting the earth?