Mr. E

Mr. E is an anonymous person who assists the Mystery Inc. gang in their mysteries.

At the end of Beware The Beast From Below he called K-ghoul and said that they shouldn't have brought back the locket that Daphne Blake found in the sewers and that the real mystery has just begun. Then in The Creeping Creatures he sent the gang to Gatorsburg and replaced their stolen engine. In The Secret Of The Ghost Rig gave them a CD that helped them solve the case. When Daphne was kidnapped by the Man-Crab in Revenge Of The Man Crab, Mr. E provided an 8-Track casette and an article talking about other people disappearing, meaning the kidnappings have had happened before. In the The Legend Of Alice May, he also provided an old year book, with a page about the previous Mystery Inc..

It appears that Mr. E is trying to make sure the gang stays together when Scooby and the gang tried to break up.

Clues
So far in the series, Mr. E has supplied clues to the gang for them to solve the Curse of Crystal Cove mystery. The current clues include:
 * An imitation gator skin purse (The Creeping Creatures)
 * An old 8-track casette and a newspaper article with a large piece missing (Revenge Of The Man Crab)
 * A Crystal Cove High yearbook from the past featuring a picture of the previous Mystery Inc. (The Legend Of Alice May)
 * A box Velma found with two pieces of paper in it. One saying "This has all happened before" and the other was a picture of the previous Mystery Inc. with a red circle around their mascot. (The Grasp Of The Gnome)
 * Text message said they had to follow Professor Pericles if they want to solve the mystery. However, The Mytery Inc gang doesn't know that Professor Perciles escaped yet. (Howl Of The Fright Hound)
 * A physics book by the henchmen with a magazine. (The Secret Serum)
 * Mr. E has left them a box belonging to the Darrow family, along with a note which reads that the old Mystery Inc. might never have disappeared if they had this box in their possession. Upon opening the box, its contents are revealed to be an entire history of Crystal Cove. Velma states that it seems that one mystery has become two.

mIdentity

 * When Daphne was showing the locket to Raffalo, Mayor Jones stared with shock, then anger.
 * Professor Pericles warned the gang to beware those close to them.
 * what does it mean