10 ‘Happy Days’ Guest Stars You May Have Forgotten About—From Robin Williams to Tom Hanks
The show was visited by cast members of 'The Brady Bunch,' 'Bonanza' and 'The Andy Griffith Show'
For all the attention given to its iconic core cast—Ron Howard’s earnest Richie, Henry Winkler’s effortlessly cool Fonzie, Tom Bosley and Marion Ross as TV’s ultimate parental duo—one of the most fascinating aspects of Happy Days was the steady stream of guest stars who popped in and out of Arnold’s and the Cunningham living room. Some were already well known, while others were just starting out and a few went on to become superstars in their own right.
Today, the names are certainly familiar: Robin Williams, who debuted his Mork from Ork character on Happy Days, which allowed ABC to give the green light for Mork & Mindy. Or Tom Hanks, still years away from his first Oscar, getting into a karate match with Fonzie over an old grudge. Back then? We didn’t know them at the time, but obviously they’d never be forgotten.
And there were others—veterans like Danny Thomas and Lorne Greene—who brought gravitas and a bit of old Hollywood charm to their guest spots. Or familiar TV faces like Maureen McCormick and Christopher Knight, stepping outside of The Brady Bunch household to try something new. Even Laverne & Shirley got its unofficial launch thanks to Penny Marshall and Cindy Williams’ guest spot on the show.
So, let’s Fonzie-smack the jukebox to life and take a closer look at 10 unforgettable guest stars who left their mark on Happy Days.
1. Robin Williams
Episode: “My Favorite Orkan” (Season 5, Episode 22)
Role: Robin Williams portrays Mork, an alien from the planet Ork, who arrives in Milwaukee to study human behavior. After Richie Cunningham claims to have seen a flying saucer, Mork appears in his bedroom intending to take him back to Ork as a specimen of an average human. The episode humorously explores Mork’s attempts to understand Earth customs—such as shaking hands with his fingers—and features a psychic showdown between Mork and Fonzie, who uses his famed “thumb power” to try and defeat the extraterrestrial visitor. Originally, the episode ends with Richie awakening to discover it was all a dream. However, for syndication, a new ending was filmed in which Mork reports back to his superior, Orson, revealing that he had erased everyone’s memory, thereby making the events real within the show’s continuity.
Fun Fact: This episode served as a backdoor pilot for Mork & Mindy, which premiered in 1978 and launched Robin Williams to stardom. Williams’s audition was notably unconventional; when asked to take a seat, he sat on his head, prompting producer Garry Marshall to quip that he was “the only alien who auditioned.” His improvisational skills and unique comedic energy during the taping impressed the cast and crew, leading directly to the development of the spin-off.
2. Tom Hanks
Episode Title: “A Little Case of Revenge” (Season 10, Episode 5)
Role: Tom Hanks guest stars as Dr. Dwayne Twitchell, a karate expert who returns to Milwaukee seeking revenge on Fonzie for a childhood incident. Twitchell challenges Fonzie to a fight, leading to a memorable confrontation where he becomes the first person to physically strike Fonzie on the show, kicking him through the stained-glass window of Al’s Drive-In.
Fun Fact: This episode aired on November 9, 1982, shortly after Bosom Buddies ended its two-season run. Although Hanks was already known to TV audiences, it was his comedic guest spot on Happy Days that caught the attention of Ron Howard and helped land him the lead in Splash (1984), marking his big-screen breakthrough. Years later, Hanks and Winkler would both work on the 1996 film That Thing You Do!—which Hanks directed—though Winkler has joked he wasn’t offered a role.
3. Danny Thomas
Episode Title: “Grandpa’s Visit” (Season 5, Episode 14)
Role: Danny Thomas guest stars as Sean Cunningham, Howard Cunningham’s father. In this episode, Grandpa Cunningham visits the family, bringing with him traditional values and a strong personality. His old-fashioned views lead to humorous generational clashes, particularly with Richie and Joanie, while Marion and Howard attempt to mediate. The episode delves into Howard’s family background, offering viewers insight into his upbringing and familial roots.
Fun Fact: Airing on January 3, 1978, this episode marked a notable guest appearance for Danny Thomas, renowned for his role in Make Room for Daddy (also known as The Danny Thomas Show). His portrayal of Howard’s father added a layer of prestige to the episode and provided a heartfelt exploration of intergenerational family dynamics.
4. Lorne Greene
Episode Title: “Hollywood, Part 1” (Season 5, Episode 1)
Role: Lorne Greene made a brief, uncredited cameo in this episode, dressed as his iconic character Ben Cartwright from the series Bonanza, adding a touch of classic television nostalgia to the storyline. The plot follows Fonzie and Richie as they travel to Hollywood, where Fonzie has been invited to screen test for a movie role.
Fun Fact: Greene’s cameo was part of a larger tradition in the two-part Hollywood storyline, which featured real-life celebrity sightings to emphasize Fonzie’s growing stardom. Although best known for his role as Ben Cartwright on Bonanza, Greene was a familiar face to ABC audiences, and his appearance was a nod to both classic television and the network’s stable of stars.
5. Penny Marshall & Cindy Williams
Episode Title: “A Date with Fonzie” (Season 3, Episode 22)
Role: In “A Date with Fonzie,” Penny Marshall and Cindy Williams made their debut as Laverne DeFazio and Shirley Feeney, respectively. In the episode, Fonzie arranges a double date for himself and Richie Cunningham with Laverne and Shirley, two spirited bottle-cappers from the Shotz Brewery. The episode humorously explores the dynamics of the double date, showcasing the contrasting personalities of the characters and leading to comedic situations.
Fun Fact: Although Cindy Williams had previously appeared on Happy Days as a different character (season 1, episode 3), this was the true launch of Laverne and Shirley as part of the Happy Days universe. Their guest spot was so successful it immediately led to the development of Laverne & Shirley, which premiered the following year and became a ratings juggernaut.
6. Maureen McCormick
Episode Title: “Cruisin'” (Season 2, Episode 16)
Role: Maureen McCormick guest stars as Hildie, one of three girls Richie, Potsie, and Ralph meet while cruising in Howard’s DeSoto after Marion accidentally dents Richie’s car. The boys’ attempts to impress the girls lead them into trouble when they discover the girls are dating members of a local gang called the Dragons. A drag race ensues, orchestrated by Fonzie, culminating in the revelation that the girls were using the boys to make their boyfriends jealous.
Fun Fact: This episode marked Maureen McCormick’s first major guest-starring role following the conclusion of The Brady Bunch in 1974.
7. Christopher Knight
Episode Title: “Be My Valentine” (Season 5, Episode 20)
Role: Christopher Knight guest stars as Binky Hodges. In “Be My Valentine,” Joanie Cunningham eagerly awaits her date, Binky, who is delayed. As she waits, Joanie daydreams about romantic scenarios involving her friends and family, leading to several musical dream sequences. Eventually, Binky arrives and presents Joanie with a locket, and they decide to spend the evening together at Inspiration Point.
Fun Fact: This episode aired on February 14, 1978—Valentine’s Day itself. Knight, already well-known for his role as Peter Brady on The Brady Bunch, appeared during a time when many 1970s TV stars were making crossover guest appearances on popular sitcoms. His presence gave the episode extra promotional appeal due to The Brady Bunch’s lasting popularity in reruns at the time.
8. Charlene Tilton
Episode: “They Shoot Fonzies, Don’t They?” (Season 4, Episode 8)
Role: Charle Tilton guest stars as Jill Higgins. As things unfold, Joanie is cut from the cheerleading squad by the confident and competitive Jill. Determined to prove herself, Joanie enters a dance marathon at Arnold’s Drive-In, enlisting Fonzie as her partner. Despite Fonzie’s exhaustion from pushing his broken motorcycle twelve miles, he joins the marathon to support Joanie. The competition culminates in a high-energy showdown between Joanie and Fonzie versus Jill and her partner Bubba, with Joanie’s team ultimately triumphing.
Fun Fact: This episode aired on November 1, 1976, and marked one of Tilton’s first TV appearances. Just two years later, she’d land the iconic role of Lucy Ewing on Dallas. The title of the episode is a play on the 1969 film They Shoot Horses, Don’t They?, which also centered around a grueling dance marathon.
9. Nancy Walker
Episode Title: “The Third Anniversary Show” (Season 4, Episode 17)
Role: Nancy Walker guest stars as Nancy Blansky, Howard Cunningham’s cousin from Las Vegas. In this special clip show, Richie and Joanie plan a surprise party for their parents’ wedding anniversary. Nancy’s arrival adds a lively dynamic to the celebration, introducing her as a vibrant, showbiz-savvy relative. Her character’s presence serves as a bridge between the nostalgic flashbacks and the current festivities, providing both humor and a fresh perspective.
Fun Fact: This episode, which aired on February 4, 1977, served as a backdoor pilot for Blansky’s Beauties, a spin-off series that premiered just eight days later on February 12, 1977 . In the new series, Nancy Blansky is portrayed as a seasoned Las Vegas showbiz veteran who acts as a den mother to a group of aspiring showgirls. Despite the character’s introduction in the 1950s setting of Happy Days, Blansky’s Beauties is set in the contemporary 1977 timeline, creating a unique cross-era connection between the two shows.
10. Jack Dodson
Episode Title: “A Sight for Sore Eyes” (Season 3, Episode 23)
Role: Fonzie experiences persistent headaches and reluctantly visits Dr. Malph, who diagnoses him with a vision issue requiring glasses. Fonzie, concerned that wearing glasses might compromise his cool image, resists the idea, leading to humorous attempts by his friends to change his mind.
Fun Fact: Jack Dodson is best known for his role as Howard Sprague on The Andy Griffith Show. His recurring role as Dr. Mickey Malph on Happy Days allowed him to bring the same kind of soft-spoken charm to a new generation of viewers. He appeared in multiple episodes across different seasons, establishing Dr. Malph as one of the show’s few adult characters outside the Cunningham family who interacted regularly with the younger cast.
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