Scooby and the gang must help Fred with a certain problem pertaining a certain face he hadn't accused of in a long time, and they also encounter a large red herring fish that stalks the gang.
August ???, 2017
- Mystery Inc.:
- Scooby-Doo (Frank Welker)
- Shaggy Rogers (Matthew Lillard)
- Fred Jones, Jr. (Frank Welker) - his full name is revealed is Frederick Jones Junior, ??? years ago during the events of A Pup Named Scooby-Doo, he accused Red Herring way too much, so he asked his father, Fred Jones, Sr. to order a court order to prove Red Herring is always a criminal
- Daphne Blake (Grey Griffin) - the Red Herring fish kidnaps her and makes her his very own "Little Mermaid", by switching her clothes with a green rubber tail and a strapless purple seashell bra
- Velma Dinkley (Kate Micucci)
- Red Herring Fish (Scott Menville) - the mutated fish version of Red Herring, he was caught at a shipment being caught by Red Herring mist turning into a mutated Red Herring Fish
- Fred Jones, Sr. (Gary Cole) - was once a lawyer in A Pup Named Scooby-Doo, 10 years later in the current events he was Mayor of Crystal Cove
- Red Herring (Scott Menville) - 18-years old after the events of A Pup Named Scooby-Doo, now a boarding school student, Reason: he blames Fred for him being sent to Boarding school in court, since Fred Jones, Sr. decided Boarding School was the best way Fred and Red Herring can avoid seeing each other
- Helen Pierce (Hynden Walch) - Red Herring's girlfriend at Boarding School, who rides with him in his car, Reason: she is often opening her hatch which contains Fish products.
- Fergus Lloyd (Khary Payton) - Red Herring's best friend at Boarding School, Reason: Seen with Fishing equipment.
- Emit Gus (Greg Cipes) - Red Herring's sidekick working for him and using cals to pull pranks, Reason: his cell phone # was found on Herring's flesh.
- Dahlia Morse (Tara Strong) - Red Herring's girlfriend's best friend, Reason: she is seen working at the docks.
- Amos Lee (Ron Perlman) - the owner of the Yacht, Reason: he witnessed Red Herring accidentally tripping into the oil and possibly dying in the ocean
- The term "Red Herring" always mean misinformation campaigns
- Red Herring/Red Herring Fish (Scott Menville) - Reason: to teach Fred a lesson of falsely accusing him.