Franklin Wendell Welker (born March 12, 1946) is an American voice actor with an extensive career spanning nearly six decades. As of 2021, Welker holds over 860 film, television, and video game credits, making him one of the most prolific voice actors of all time. With a total worldwide box-office gross of $17.4 billion, he is also the third highest-grossing film voice actor of all time. Welker is best known for voicing Fred Jones in the Scooby-Doo franchise since its inception in 1969, and Scooby-Doo himself since 2002. In 2020, Welker reprised the latter role in the CGI-animated film Scoob!, the only original voice actor from the series in the movie's cast. He has also voiced Oswald the Lucky Rabbit in Epic Mickey and its sequel, Megatron, Galvatron and Soundwave in the Transformers franchise, Shao Kahn and Reptile in the 1995 Mortal Kombat film, Curious George in the Curious George franchise, Garfield on The Garfield Show, Nibbler on Futurama, the titular character in Jabberjaw, Speed Buggy in the Scooby-Doo franchise, Astro and Orbitty on The Jetsons, Mushmouse on Punkin' Puss & Mushmouse, and various characters in The Smurfs as well as numerous animal vocal effects in many works. In 2016, he was honored with an Emmy Award for his lifetime achievement. Description above from the Wikipedia article Frank Welker, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Frank Welker plays as Nibbler (voice) in Be Cool, Scooby-Doo!.
Frank Welker is the top #1 member of the cast and appears in 124 episodes.

Grey DeLisle (born August 24, 1973), sometimes credited as Grey Griffin, is an American voice actress, comedian and singer-songwriter. DeLisle is known for various roles in animated productions and video games. On September 27, 2018, she released her debut comedy act, titled "My First Comedy Special". On November 10, 2019, The Simpsons producers announced that DeLisle would replace Russi Taylor as the voice of Martin Prince and Sherri and Terri, after Taylor's death in July 2019. Description above from the Wikipedia article Grey DeLisle, licensed under CC-BY-SA, full list of contributors on Wikipedia .

Grey DeLisle plays as Diana Prince, Wonder Woman (voice) in Be Cool, Scooby-Doo!.
Grey DeLisle is the top #2 member of the cast and appears in 78 episodes.

Matthew Lyn Lillard (born January 24, 1970) is an American actor, comedian, director, and producer. His early film work includes Chip Sutphin in Serial Mom (1994), Emmanuel "Cereal Killer" Goldstein in Hackers (1995), Stu Macher in Scream (1996), Stevo in SLC Punk! (1998), Brock Hudson in She's All That (1999), and Billy Brubaker in Summer Catch (2001). He played Shaggy Rogers in Scooby-Doo (2002) and its sequel Scooby-Doo 2: Monsters Unleashed (2004), and in animation, he has been the voice of Shaggy since Casey Kasem retired from the role in 2009. Lillard's later film roles include Jerry Conlaine in Without a Paddle (2004), Dez Howard in The Groomsmen (2006), Joey in Home Run Showdown (2012), and Jack Rusoe in Return to Nim's Island (2013). While much of his work is comedic in nature, Lillard has also given dramatic performances in movies such as The Descendants (2011), Trouble with the Curve (2012), Match (2014), and Twin Peaks: The Return (2017). He made his directorial debut with the coming-of-age drama Fat Kid Rules the World (2012). From 2018 to 2021, Lillard also starred as Dean Boland in the television series Good Girls. Description above from the Wikipedia article Matthew Lillard, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Matthew Lillard plays as Shaggy Rogers (voice) in Be Cool, Scooby-Doo!.
Matthew Lillard is the top #3 member of the cast and appears in 52 episodes.

Kate was born in New Jersey and spent most of her school years in Pennsylvania. As a kid she focused on playing outside in the woods and playing classical piano.  In college she majored in art, focusing on painting and making puppets. She received an A.A. in Fine Arts from Keystone College.  After a small stint watering banana and pineapple plants in Hawaii, Kate decided to go to Loyola Marymount University in Los Angeles where she made more puppets and received a B.A. in Studio Art.  In 2008, Kate resides in Los Angeles where she has a steady gig building sandcastles. She also works as an actor and can be found around town playing the ukulele.

Kate Micucci plays as Velma Dinkley (voice) in Be Cool, Scooby-Doo!.
Kate Micucci is the top #4 member of the cast and appears in 52 episodes.