Mr. Pursell is the History teacher of Portal High School. He appears to be the only teacher to cater only to Doombly's interests; however, as he has only been seen teaching under Principal GLaDOS, Principal Business Man's influence cannot be argued.
He is introduced in TEEN FORTRESS 2, where he is teaching about how "hot dugs" are made. In the same story, he is also shown to be drawing "a dog an rabbit solving criem", a direct allusion to Sam and Max.
His next big appearance is in HARRY POTTER AN THE KILL OF SNAPE, where he teaches about Robot and Roslalonde Lettuce, supposedly dead. The story influences Gabe Jonson to build a portal gun, (supposedly learning the mistake that Robot and Roslalonde did by building a portal machine) giving the foundation to Portal Labs. He also gifts his picture of a dog and a rabbit, on which he also drew Wheatly and Jenny Weasley, to them.
- People pointed out that Sam and Max has been adapted to a series of games made by Telltale Games. The forums of Telltale Games turned out to be home to Telltale Fanfic Theater 3000.
- A reference to another Telltale title, Back to the Future: The Game, appears in Marrissaverse Stories 2015.