Sykes, a character from Captain Caveman and the Teen Angels. Dick Dastardly, from Hanna-Barbera's Wacky Races, will be the film's main antagonist, voiced by Jason Isaacs. In March 2020, the film's theatrical release was delayed indefinitely due to the COVID-19 pandemic. On April 22, 2020, Warner Bros. announced that due to movie theater closures the theatrical release for Scoob! had been cancelled, with the film released instead on Premium Video On Demand in the United States and Canada on May 15, 2020, the original date of release. In July 2020, Warner Bros. confirmed the film would still play in theaters in select countries with relaxed COVID-19 restrictions. The film subsequently received a secondary theatrical release in the United States beginning on May 21, 2021, in selected markets. Cast Scooby-Doo: Don Messick was the original voice of Scooby-Doo from 1969 until 1996. Hadley Kay performed the voice for the Johnny Bravo episodes "Bravo Dooby-Doo" and "'Twas the Night", as well as in commercials, in 1997. Scott Innes was the voice of Scooby-Doo from 1998 to 2002. Neil Fanning voiced Scooby-Doo in the live-action Warner Bros. theatrical films produced in 2002 and 2004. Frank Welker is the current voice of Scooby-Doo, having taken over the role from Innes in 2002, although Innes voiced the character in video game projects (including PC, DVD and board games), commercials and some toys until 2008. Dave Coulier (2005) and Seth Green (2007, 2012, 2018) voiced Scooby in the Robot Chicken parodies. Norville "Shaggy" Rogers: Casey Kasem was the original voice of Shaggy from 1969 until 1997. Billy West voiced Shaggy in Scooby-Doo on Zombie Island and Scooby-Doo: Behind the Scenes in 1998. Scott Innes voiced the character from 1999 to 2002 and he continued to voice Shaggy in video game projects (including PC, DVD and board games), commercials and some toys until 2009. Casey Kasem returned to the voice role in 2002 and continued as Shaggy until 2009. In 2006, Kasem continued to voice Shaggy only in the direct-to-video film series until 2009, while Scott Menville performed the voice of Shaggy in the 2006–08 CW series Shaggy & Scooby-Doo Get a Clue!. Matthew Lillard appeared as Shaggy in the live action 2002 and 2004 theatrical films, and took over as the voice of the animated character in 2010. He also voiced Shaggy in four stop-motion parody sketches for the Adult Swim show Robot Chicken. Nick Palatas