Allen is Wild West's stepdad in "Old West", who helped raise him as a child and keep his blood sugar in check while his father, Old West, was out of his life. According to Wild, he does not believe in vaccines.
Allen meets Old for the first time during a father-son confrontation at the Wild West Ranch, attempting to diffuse the situation but to no avail. After taking Principal Shepherd home via carpool, he later assists Peter, Cleveland, and Quagmire elude Joe and bust Old out of the local jail. During the scheme, he repeatedly suggests that the others take him out for drinks as a thank-you.
Allen is voiced by Tony Hale.