Claim: Ron Perlman is in Adventure Time.
Evidence: He is also known for his voice-over work as the narrator of the post-apocalyptic game series Fallout , Clayface on Batman : The Animated Series , Slade on the animated series Teen Titans , The Lich in Adventure Time , The Stabbington Brothers in Disney 's animated film Tangled , and as the narrator of the television series 1000 Ways to Die.