The warrior epic is a genre rife with comedic fodder. Still, it takes a special talent to successfully stretch the parodic through a feature-length runtime. If anyone could do it, you’d think it would be golden man-child Danny McBride, but his new film, “Your Highness,” just can’t surmount its stock sources, no matter how many dick jokes it throws at us.

McBride, who co-wrote the script with Ben Best, plays Thadeous, a medieval version of the character that’s made him famous: an idolent stoner lacking even a basic understanding of decorum. As the younger brother of the gallant Prince Fabious, Thadeous is left to slack and screw in the shadows; but when Fabious’s bride-to-be is kidnapped by an evil wizard, the king demands that Thadeous grow-up and quest out with his fearless sibling.

What follows is a telegraphed story wherein McBride finds humor in anachronism, modern dialogue, and a heavy helping of the word “fuck,” which draws out a lot of laughs but ultimately isn’t any different from, say, Kenny Powers—the difference being that there’s a degree of nuance to Kenny’s character not found here, one that is as poignant and downtrodden as it is comical. And verbose critical analysis aside, Kenny is just outright funnier than Thadeous, as are the other “Eastbound & Down” analogues.

The only moments worthy of note in “Your Highness” come out the movie’s weirder elements. While McBride and co. could have played it safe in terms of quirk, they decided to lace the movie with pedofilic turtle-slug creatures, a genital-less Judas, a mechanical bird companion named Simon, and a Jabba-esque forest king with a harem of sadistic women. These pieces are hit-or-miss, but kudos to the writers for trying their hands at what is surely marginal humor.

McBride and Best’s greatest skill has always been their ability to mingle the highbrow with the low, but in “Your Highness” we see a little too much of the latter, with lackluster humor to support it. McBride is an amazing talent, both as a writer and comedic actor, so let’s hope this is just a gentle stumble and not the indicator of a downward slide.