During World War II, Nichols animated several short subjects, including First Aiders (1944)[2] and numerous cartoons involving the character Pluto.
[12] Nichols directed the adventure-themed Jonny Quest and Space Ghost[13] in addition to the comedic Quick Draw McGraw,[14] The Jetsons and The Flintstones.
[16] Nichols continued directing at Hanna-Barbera during the 1970s, working on Super Friends,[17] Hong Kong Phooey, Goober and the Ghost Chasers,[18] and The Scooby-Doo Show.
[19] In a mixed review, The New York Times felt the animation was "uninteresting" but noted the film stayed true to the book on which it was based.
Near the end of his career, Nichols returned to Disney, working on The New Adventures of Winnie the Pooh, Darkwing Duck, and Goof Troop, the latter of which aired posthumously.