When the masks come off, the creepy creatures come out! Watch Fred, Shaggy, and the rest of the gang uncover who lies behind some of the best disguises to date! Nothing says Halloween like a good mystery. Celebrate #Scoobtober all month long and stream NEW EPISODES of Scooby-Doo and Guess Who? AND more of your fav Classic Scooby-Doo series on HBO Max now! Subscribe: youtube.com/hbomaxfamily  Be the first to know more: HBO Max: hbom.ax/YTFam  Like HBO Max Family on Facebook: bit.ly/HBOMaxFamilyFB  Follow HBO Max Family on Instagram: bit.ly/HBOMaxFamilyIG  About HBO Max: HBO Max is WarnerMedia’s direct-to-consumer offering with 10,000 hours of curated premium content. HBO Max offers powerhouse programming for everyone in the home, bringing together HBO, a robust slate of new original series, key third-party licensed programs and movies, and fan favorites from WarnerMedia’s rich library including Warner Bros., New Line, DC, CNN, TNT, TBS, truTV, Turner C...