An 80s-animation-inspired animation commissioned by D&D Beyond after Critical Role star Sam Riegel, as a bit for D&D Beyond's sponsorship of the show, sang an 80s-inspired jingle, which was later turned into the official theme for D&D Beyond and paired with a fully animated intro featuring the characters of Critical Role.
The animation breakdown for the intro.
D&D Beyond Theme Song by Sam Riegel and Mr. Fantastic