[s1e20] The Siren's Song -

: It is often praised for its "creepy mystery" and the emotional depth given to Velma's character.

"The Siren's Song" - Scooby-Doo! Mystery Incorporated (S1E20) [S1E20] The Siren's Song

: Velma discovers that Destroido covered up an incident from 20 years ago, which explains why no records existed in the local papers. Production Details Air Date : This episode originally aired in mid-2011. : It is often praised for its "creepy

: Features the primary voice cast, including Mindy Cohn as Velma and Frank Welker as Fred/Scooby. Production Details Air Date : This episode originally

The gang eventually uncovers a plot by and his group of radical environmentalists. Dressed as "Fish Freaks," they plan to trigger a massive oil spill to destroy the environment as a way to "save it" by proving its vulnerability. Key Revelations

: This episode marks a major turning point in the series’ central mystery. Velma confronts Angel Dynamite , accusing her of being Cassidy Williams , a member of the original Mystery Incorporated who vanished years ago.