Don Messick did provide the voice for both Astro and Scooby .
Don was a very prolific voice actor so your best bet it to look him up on Wikipedia to see a complete list of his characters however, his most well known roles are ... Droopy, Boo-Boo Bear & Ranger Smith from Yogi Bear, Bamm-Bamm from The Flintstones, Astro from The Jetsons, Dr. Benton Quest & Bandit from Jonny Quest, Scooby-Doo & Papa Smurf.
The actor's voice is the same pitch as the character's voice, with different inflection.
Scrappy is Scooby-Doo's nephew. Specifically, he's the son of Scooby's sister Ruby-Doo.
of course
The Astro Megazord cockpit was in the NASADA Shuttle which formed the Astro Megazord's head.
Astro
Frank Welker. He's also Scooby's voice
Casey Kasem
Jennifer Lawrence.
He's a Great Dane, like Marmaduke and Astro of The Jetsons.
by campfire mystery do you mean camp scare? if so the voice actor is Grey DeLisle
Matthew Lyn Lillard is an American actor, voice actor, director, and producer who did play John Cena's voice.
The same guy from the first one, Hugo Weaving, but he must of put on a slightly different voice becauses it wasn't quite the same.
A variety of voice actors have had the pleasure of lending their talents to Scooby-Doo in the 40-plus years of the franchise.Don Messick - a veteran voice actor and Hanna-Barbara regular was the first to lend his talents to Scooby-Doo starting with the first season in 1969 through to the 1994 appearance of Scooby-Doo and Shaggy as narrators of the made for TV movie Arabian Nights.In the Scooby-Doo movies produced in the 1990, Scott Innes voiced Scooby-Doo.Starting in 2000,Frank Welker took over as Scooby's voice actor - which he continues to provide for the various animated ventures and direct to DVD movies of the beloved Scooby-Doo franchise.Neil Fanning voiced Scooby-Doo in the 2002 and 2004 movies.
Frank Welker
Kimberly Brooks does the voice of Luna in "Scooby-Doo and the Witch's Ghost."
The anthropomorphic dogs Scooby Doo and Astro (of the Jetsons) used the term, which is shown in transcripts as "ruh-roh" -- meaning, of course, "uh oh."