: Retired veteran astronauts voiced by Mark Hamill and Jeff Bennett . U-Boat : A technology-hating football star. H.A.M. : A dry-witted robot voiced by Diedrich Bader . The Mystery & Themes Scooby Doo Moon Monster Madness is OVERRATED : r/Scoobydoo

The story kicks off with the gang winning a lottery for the final five seats on the Sly Star One , a brand-new space cruise ship owned by billionaire Sly Baron . What starts as a luxury voyage quickly turns into a nightmare when a savage, Xenomorph-inspired alien attacks the ship, forcing an emergency landing at Sly Moon Prime , a resort on the dark side of the moon. Stranded and under siege, the gang must solve the mystery of the moon monster before they are marooned forever.

: Frank Welker (Scooby-Doo/Fred), Matthew Lillard (Shaggy), Grey Griffin (Daphne), and Mindy Cohn (Velma). The Suspects :

The film features the iconic voice cast of the era alongside several high-profile guest stars:

: A celebrated astronaut voiced by Jennifer Hale .

is a 2015 direct-to-DVD animated science fiction comedy that blasts Mystery Inc. into outer space. Released on February 17, 2015, it marks the twenty-third installment in the long-running direct-to-video film series . Plot Summary