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The Mystery Inc. evil clones were a set of Hollywood extras impersonating the gang, led by J.C. Chasez, disguised as Scooby-Doo.
Physical appearance
With their masks on, they looked exactly like the gang, except for having glowing, red eyes.
Powers and abilities
In some unexplained way, they all had preposterous strength. They were capable of mighty leaps and three together could lift the Mystery Machine.
History
What's New, Scooby-Doo?
Season three

J.C. Chasez unmasked
For a few weeks, they were kidnapping teenagers from Lover's Lane, putting the blame on the real gang.
When the gang were investigating Lover's Lane they attacked them, but escaped. They also left a confession letter so the real group would be arrested.
But when Officer McBride gave them a chance to clear their names, they were caught in a trap and the Scooby clone was unmasked as J.C. Chasez.

Extras unmasked
Chasez was trying to get rid of Shaggy Rogers because he was jealous that his girlfriend, Rachel, was always talking about Shaggy's exploits. The other clones were hired actors.
Appearances
Notes/trivia
- Each of the extras playing the other Mystery Inc. members are animated cameos of the real actors who voice the group in the show. From left to right in the image above they are Grey DeLisle (Daphne Blake), Frank Welker (Fred Jones), Mindy Cohn (Velma Dinkley), and Casey Kasem (Shaggy Rogers). The only exception is J.C. Chasez, who was wearing a Scooby-Doo mask.