Benjy (The Pizza Delivery from Beyond!)

Benjy was the former champion of Vito's Pizza Barn's Annual Pizza Eating Contest 3 years before the events depicted in The Pizza Delivery from Beyond! and the true identity of the Pizza Delivery Monster.

Physical appearence
Benjy is a Caucasian teenager with blonde hair who wears glasses. Considering the fact he knows how to drive he should be in his High School years.

A Pup Named Scooby-Doo (Archie Comics)
The Pizza Delivery Monster attacked Shaggy Roggers & Scooby Doo near the Rogers home while the two were waiting for a pizza delivery from Vito's calling them to cancel their attendance to the contest when the two managed to fool him into their fake S & S Pizza Place where they have attached him a monkey that he quickly got rid of. Later, after Mr. O'Greazy was expelled from the resturant, Benjy is first seen in his normal clothes while the Scooby-Doo Detective Agency arrives to the Pizza Barn eating there by himself and questioning Shaggy & Scooby's decision to drop out of the next contest.

He's later caught in a trap the gang prepared near Shaggy's house and is unmasked by Velma Dinkley.