Question: What comic strip, created by Robert Crumb, did Manuel "Manny" Perez work on later in his career?

Context paragraphs:
S. Clay Wilson: Steve Clay Wilson (born July 25, 1941), better known as S. Clay Wilson, is an American underground cartoonist and central figure in the underground comix movement.  Wilson attracted attention from readers with aggressively violent and sexually explicit panoramas of lowlife denizens, often depicting the wild escapades of pirates and bikers.  He was an early contributor to "Zap Comix", and Wilson's artistic audacity has been cited by Robert Crumb as a liberating source of inspiration for Crumb's own work.  Recalling he first saw Wilson's work (in about 1968) Robert Crumb said, "The content was something like I'd never seen before, anywhere, the level of mayhem, violence, dismemberment, naked women, loose body parts, huge, obscene sex organs, a nightmare vision of hell-on-earth never so graphically illustrated before in the history of art... Suddenly my own work seemed insipid..."

Introducing Kafka: Introducing Kafka, also known as R. Crumb's Kafka, is an illustrated biography of Franz Kafka by David Zane Mairowitz and Robert Crumb.  The book includes comic adaptations of some of Kafka's most famous works including "The Metamorphosis", "A Hunger Artist", "In the Penal Colony", and "The Judgment", as well as brief sketches of his three novels "The Trial", "The Castle", and "Amerika".  The book also details Kafka's biography in a format that is part illustrated essay, part sequential comic panels.  The book was released as part of the "Introducing..." series by Totem Books; the popularity of Crumb's renditions of Kafka's works led to additional printings under the title "R. Crumb's Kafka",and its most recent edition by Fantagraphics Books (2007) is simply titled "Kafka".

Maxon Crumb: Maxon Crumb (born 1945) is an American artist.  He is the younger brother of underground cartoonist Robert Crumb and Charles Crumb, and the uncle of Sophie Crumb.  He also had two sisters, Carol DeGennaro and Sandra Colorado (1946-1998), who was the widow of writer Marty Pahls, a friend of Robert Crumb.  His parents are Charles Crumb and Beatrice Crumb.

Manuel Perez (animator): Manuel 'Manny' Perez (17 June 1914 – 18 January 1981) was a Mexican American animator and animation director whose career spanned 40 years, from the 1940s to the 1980s, and best known for his work on the Warner Bros. animated shorts, working on such cartoons as Bugs Bunny and Daffy Duck.  Later in his career he worked on Fritz the Cat and "The Lord of the Rings".

George Herriman: George Joseph Herriman (August 22, 1880 – April 25, 1944) was an American cartoonist best known for the comic strip "Krazy Kat" (1913–1944).  More influential than popular, "Krazy Kat" had an appreciative audience among those in the arts.  Gilbert Seldes' article "The Krazy Kat Who Walks by Himself" was the earliest example of a critic from the high arts giving serious attention to a comic strip. " The Comics Journal" placed the strip first on its list of the greatest comics of the 20th century.  Herriman's work has been a primary influence on cartoonists such as Will Eisner, Charles M. Schulz, Robert Crumb, Art Spiegelman, Bill Watterson, and Chris Ware.

Keep on Truckin' (comics): Keep on Truckin&apos; is a one-page comic by Robert Crumb.  It was published in the first issue of "Zap Comix" in 1968.  A visual riff on the lyrics of the Blind Boy Fuller song "Truckin' My Blues Away", it consists of an assortment of men, drawn in Crumb's distinctive style, strutting confidently across various landscapes.  The strip's drawings became iconic images of optimism during the hippie era.

Crumb (film): Crumb is a 1994 documentary film about the noted underground cartoonist Robert Crumb (R. Crumb) and his family.  Directed by Terry Zwigoff and produced by Lynn O'Donnell, it won widespread acclaim.  It was released in the USA on April 28, 1995, having been screened at film festivals the previous year.  Jeffery M. Anderson (later critic for the "San Francisco Examiner") placed the film on his list of the ten greatest films of all time, labeling it "the greatest documentary ever made."

Fritz the Cat: Fritz the Cat is a comic strip created by Robert Crumb.  Set in a "supercity" of anthropomorphic animals, the strip focuses on Fritz, a feline con artist who frequently goes on wild adventures that sometimes involve sexual escapades.  Crumb began drawing this character in homemade comic books when he was a child.  Fritz became one of his most famous characters, thanks largely to the motion picture adaptation by Ralph Bakshi.

R. Crumb and his Cheap Suit Serenaders No. 2: R. Crumb and his Cheap Suit Serenaders Number 2 is the second 33⅓ rpm album by the retro string band R. Crumb & His Cheap Suit Serenaders and its subtitle was "Persian Rug, Crying My Blues Away, Moana March and Other Favorites".  The album was later retitled Chasin' Rainbows in re-release on CD (Shanachie 6002, 1993 - ASIN: B000000DSO) from Shanachie Records.  The band's personnel includes Robert Crumb on lead vocal and banjo, Allan Dodge on mandolin, violin, ukulele and vocals, Robert Armstrong on guitars, accordion, banjo, musical saw and vocals, Terry Zwigoff, who later produced the documentary "Crumb", on cello.  Originally released on Blue Goose Records in 1976, this record became a collectible not only for the whimsical string band renditions of and reminiscent of the early 20th century music, but for the cover art drawn by the band's frontman and well-known comics artist Robert Crumb.

Jerry Zolten: Jerry Zolten is an American writer, advocator for, and producer of American roots music.  An Associate Professor at Penn State University, he is best known as the author of a book tracing the 30-plus year career of the African-American Dixie Hummingbirds gospel group and their influence on both sacred and secular music.  He also writes about and is a noted expert on the history of American stand-up comedy.  Zolten is also known for numerous articles and CD liner notes on blues, country, and gospel music as well as collaborations on musical projects with Robert Crumb and Harvey Pekar.  His most recent writings and musical releases include "The Beatles as Recording Artists" in "The Cambridge Companion to the Beatles," biographical and musicological entries on Paramount recording artists for "The Rise and Fall of Paramount Records 1917-1927," and "Chimpin' the Blues with Robert Crumb and Jerry Zolten," an audio collection of conversation and rare blues and blues related recordings from the early 20th Century.

Supporting paragraphs: Manuel Perez (animator) Fritz the Cat
Answer: Fritz the Cat