Pretending he had made a sequel to the 1985 Michael J. Fox film, Black offered up a trailer for the revamp during an appearance on a special edition of Jimmy Kimmel Live!
In the short film, the werewolf character, played by Black, was living in a trailer with his hirsute dad (Gass).
After a callous neighbour, played by John MCGinley, poked fun at the hairy pair, father and son decided it was time to get full body waxes and so they entered a basketball tournament to win the sum they needed for the painful makeover.
The Tenacious D twosome won the game - against MCGinley and professional basketball player John Wall - but decided not to go through with the waxing.
The spoof teaser also featured actress Rachel Bilson as a beauty salon assistant who falls for Black's Adult Wolf character.