Happy Days (TV Series) as
Ralph Malph / Purvis
- Welcome Home: Part 2 (1983) - Ralph Malph (as Donald Most)
- Welcome Home: Part 1 (1983) - Ralph Malph (as Donald Most)
- Ralph's Family Problem (1980) - Ralph Malph (as Donny Most)
- The Roaring Twenties (1980) - Ralph Malph / Purvis (as Donny Most)
- A Potsie Is Born (1980) - Ralph Malph (as Donny Most)
- Father and Son (1980) - Ralph Malph (as Donny Most)
- Fools Rush In (1980) - Ralph Malph (as Donny Most)
- Allison (1980) - Ralph Malph (as Donny Most)
- The Hucksters (1980) - Ralph Malph (as Donny Most)
- The New Arnold's (1980) - Ralph Malph (as Donny Most)
- Hot Stuff (1980) - Ralph Malph (as Donny Most)
- Joanie's Dilemma (1980) - Ralph Malph (as Donny Most)
- Ah, Wilderness (1980) - Ralph Malph (as Donny Most)
- Here Comes the Bride, Again (1979) - Ralph Malph (as Donny Most)
- They're Closing Inspiration Point (1979) - Ralph Malph (as Donny Most)
- The Mechanic (1979) - Ralph Malph (as Donny Most)
- Fonzie vs. the She-Devils (1979) - Ralph Malph (as Donny Most)
- King Richard's Big Knight (1979) - Ralph Malph (as Donny Most)
- Joanie Busts Out (1979) - Ralph Malph (as Donny Most)
- Burlesque (1979) - Ralph Malph (as Donny Most)
- Fonzie's a Thespian (1979) - Ralph Malph (as Donny Most)
- Richie Falls in Love (1979) - Ralph Malph (as Donny Most)
- Richie's Job (1979) - Ralph Malph (as Donny Most)
- Marion Goes to Jail (1979) - Ralph Malph (as Donny Most)
- Fonzie Meets Kat (1979) - Ralph Malph (as Donny Most)
- Chachi Sells His Soul (1979) - Ralph Malph (as Donny Most)
- Shotgun Wedding: Part 1 (1979) - Ralph Malph (as Donny Most)
- Potsie Quits School (1979) - Ralph Malph (as Donny Most)
- The Duel (1979) - Ralph Malph (as Donny Most)
- Mork Returns (1979) - Ralph Malph (as Donny Most)
- Fonzie's Funeral: Part 2 (1979) - Ralph Malph (as Donny Most)
- Fonzie's Funeral: Part 1 (1979) - Ralph Malph (as Donny Most)
- Marion: Fairy Godmother (1979) - Ralph Malph (as Donny Most)
- Married Strangers (1979) - Ralph Malph (as Donny Most)
- Stolen Melodies (1979) - Ralph Malph (as Donny Most)
- Ralph vs. Potsie (1979) - Ralph Malph (as Donny Most)
- Smokin' Ain't Cool (1979) - Ralph Malph (as Donny Most)
- Christmas Time (1978) - Ralph Malph (as Donny Most)
- Richie Gets Framed (1978) - Ralph Malph (as Donny Most)
- The Magic Show (1978) - Ralph Malph (as Donny Most)
- The Kissing Bandit (1978) - Ralph Malph (as Donny Most)
- The First Thanksgiving (1978) - Ralph Malph (as Donny Most)
- The Fonz Is Allergic to Girls (1978) - Ralph Malph (as Donny Most)
- The Claw Meets the Fonz (1978) - Ralph Malph (as Donny Most)
- The Evil Eye (1978) - Ralph Malph (as Donny Most)
- Fearless Malph (1978) - Ralph Malph (as Donny Most)
- Sweet Sixteen (1978) - Ralph Malph (as Donny Most)
- Kid Stuff (1978) - Ralph Malph (as Donny Most)
- Casanova Cunningham (1978) - Ralph Malph (as Donny Most)
- Fonzie's Blindness (1978) - Ralph Malph (as Donny Most)
- Westward Ho!: Part 3 (1978) - Ralph Malph (as Donny Most)
- Westward Ho!: Part 2 (1978) - Ralph Malph (as Donny Most)
- Westward Ho!: Part 1 (1978) - Ralph Malph (as Donny Most)
- Fonzie for the Defense (1978) - Ralph Malph (as Donny Most)
- Rules to Date By (1978) - Ralph Malph (as Donny Most)
- Second Wind (1978) - Ralph Malph (as Donny Most)
- Do You Want to Dance? (1978) - Ralph Malph (as Donny Most)
- Richie's Girl Exposes the Cunninghams (1978) - Ralph Malph (as Donny Most)
- My Favorite Orkan (1978) - Ralph Malph (as Donny Most)
- Our Gang (1978) - Ralph Malph (as Donny Most)
- Be My Valentine (1978) - Ralph Malph (as Donny Most)
- Spunkless Spunky (1978) - Ralph Malph (as Donny Most)
- Richie Almost Dies (1978) - Ralph Malph (as Donny Most)
- Marion's Misgivings (1978) - Ralph Malph (as Donny Most)
- Joanie's First Kiss (1978) - Ralph Malph (as Donny Most)
- Potsie Gets Pinned (1978) - Ralph Malph (as Donny Most)
- Grandpa's Visit (1978) - Ralph Malph (as Donny Most)
- Nose for News (1977) - Ralph Malph (as Donny Most)
- Requiem for a Malph (1977) - Ralph Malph (as Donny Most)
- Bye Bye Blackball (1977) - Ralph Malph (as Donny Most)
- My Fair Fonzie (1977) - Ralph Malph (as Donny Most)
- Fonzie, Rock Entrepreneur: Part 2 (1977) - Ralph Malph (as Donny Most)
- Fonzie, Rock Entrepreneur: Part 1 (1977) - Ralph Malph (as Donny Most)
- The Apartment (1977) - Ralph Malph (as Donny Most)
- Fonsillectomy (1977) - Ralph Malph (as Donny Most)
- Hard Cover (1977) - Ralph Malph (as Donny Most)
- Hollywood: Part 3 (1977) - Ralph Malph (as Donny Most)
- Hollywood: Part 2 (1977) - Ralph Malph (as Donny Most)
- Hollywood: Part 1 (1977) - Ralph Malph (as Donny Most)
- Fonzie's Baptism (1977) - Ralph Malph (as Donny Most)
- The Last of the Big Time Malphs (1977) - Ralph Malph (as Donny Most)
- Spunky Come Home (1977) - Ralph Malph (as Donny Most)
- Fonz-How, Inc. (1977) - Ralph Malph (as Donny Most)
- Joanie's Weird Boyfriend (1977) - Ralph Malph (as Donny Most)
- The Physical (1977) - Ralph Malph (as Donny Most)
- The Graduation: Part 2 (1977) - Ralph Malph (as Donny Most)
- The Graduation: Part 1 (1977) - Ralph Malph (as Donny Most)
- The Third Anniversary Show (1977) - Ralph Malph (as Donny Most)
- Marion Rebels (1977) - Ralph Malph (as Donny Most)
- A Shot in the Dark (1977) - Ralph Malph (as Donny Most)
- The Book of Records (1977) - Ralph Malph (as Donny Most)
- Time Capsule (1977) - Ralph Malph (as Donny Most)
- Fonzie's Old Lady (1977) - Ralph Malph (as Donny Most)
- Richie Branches Out (1976) - Ralph Malph (as Donny Most)
- A.K.A. the Fonz (1976) - Ralph Malph (as Donny Most)
- The Muckrakers (1976) - Ralph Malph (as Donny Most)
- They Shoot Fonzies, Don't They? (1976) - Ralph Malph (as Donny Most)
- A Place of His Own (1976) - Ralph Malph (as Donny Most)
- Fonzie's Hero (1976) - Ralph Malph (as Donny Most)
- Fonzie the Father (1976) - Ralph Malph (as Donny Most)
- A Mind of His Own (1976) - Ralph Malph (as Donny Most)
- Fonzie Loves Pinky: Part 3 (1976) - Ralph Malph (as Donny Most)
- Fonzie Loves Pinky: Part 2 (1976) - Ralph Malph (as Donny Most)
- Fonzie Loves Pinky: Part 1 (1976) - Ralph Malph (as Donny Most)
- Arnold's Wedding (1976) - Ralph Malph (as Donny Most)
- A Sight for Sore Eyes (1976) - Ralph Malph (as Donny Most)
- Bringing Up Spike (1976) - Ralph Malph (as Donny Most)
- Beauty Contest (1976) - Ralph Malph (as Donny Most)
- Two Angry Men (1976) - Ralph Malph (as Donny Most)
- Fonzie the Superstar (1976) - Ralph Malph (as Donny Most)
- Football Frolics (1976) - Ralph Malph (as Donny Most)
- Fonzie the Salesman (1976) - Ralph Malph (as Donny Most)
- The Second Anniversary Show (1976) - Ralph Malph (as Donny Most)
- Dance Contest (1976) - Ralph Malph (as Donny Most)
- Tell It to the Marines (1975) - Ralph Malph (as Donny Most)
- They Call It Potsie Love (1975) - Ralph Malph (as Donny Most)
- Fonzie's New Friend (1975) - Ralph Malph (as Donny Most)
- Three on a Porch (1975) - Ralph Malph (as Donny Most)
- A Date with Fonzie (1975) - Ralph Malph (as Donny Most)
- Fonzie the Flatfoot (1975) - Ralph Malph (as Donny Most)
- Howard's 45th Fiasco (1975) - Ralph Malph (as Donny Most)
- Jailhouse Rock (1975) - Ralph Malph (as Donny Most)
- Richie Fights Back (1975) - Ralph Malph (as Donny Most)
- The Other Richie Cunningham (1975) - Ralph Malph (as Donny Most)
- Fearless Fonzarelli: Part 2 (1975) - Ralph Malph (as Donny Most)
- Fearless Fonzarelli: Part 1 (1975) - Ralph Malph (as Donny Most)
- The Motorcycle (1975) - Ralph Malph (as Donny Most)
- Fonzie Moves In (1975) - Ralph Malph (as Donny Most)
- Goin' to Chicago (1975) - Ralph Malph (as Donny Most)
- Kiss Me Sickly (1975) - Ralph Malph (as Donny Most)
- Richie's Flip Side (1975) - Ralph Malph (as Donny Most)
- Fish and the Fins (1975) - Ralph Malph (as Donny Most)
- Fonzie Joins the Band (1975) - Ralph Malph (as Donny Most)
- Get a Job (1975) - Ralph Malph (as Donny Most)
- The Howdy Doody Show (1975) - Ralph Malph (as Donny Most)
- Cruisin' (1975) - Ralph Malph (as Donny Most)
- The Not Making of a President (1975) - Ralph Malph (as Donny Most)
- The Cunningham Caper (1975) - Ralph Malph (as Donny Most)
- Fonzie's Getting Married (1975) - Ralph Malph (as Donny Most)
- Open House (1975) - Ralph Malph (as Donny Most)
- Guess Who's Coming to Christmas (1974) - Ralph Malph (as Donny Most)
- A Star Is Bored (1974) - Ralph Malph (as Donny Most)
- Big Money (1974) - Ralph Malph (as Donny Most)
- Not with My Sister, You Don't (1974) - Ralph Malph (as Donny Most)
- Wish Upon a Star (1974) - Ralph Malph (as Donny Most)
- Haunted (1974) - Ralph Malph (as Donny Most)
- R.O.T.C. (1974) - Ralph Malph (as Donny Most)
- You Go to My Head (1974) - Ralph Malph (as Donny Most)
- Who's Sorry Now? (1974) - Ralph Malph (as Donny Most)
- Richie's Car (1974) - Ralph Malph (as Donny Most)
- Richie Moves Out (1974) - Ralph Malph (as Donny Most)
- Be the First on Your Block (1974) - Ralph Malph (as Donny Most)
- Knock Around the Block (1974) - Ralph Malph (as Donny Most)
- The Best Man (1974) - Ralph Malph (as Donny Most, credit only)
- Great Expectations (1974) - Ralph Malph (as Donny Most)
- In the Name of Love (1974) - Ralph Malph (as Donny Most)
- Because She's There (1974) - Ralph Malph (as Donny Most)
- Give the Band a Hand (1974) - Ralph Malph (as Donny Most)
- Breaking Up Is Hard to Do (1974) - Ralph Malph (as Donny Most)
- The Skin Game (1974) - Ralph Malph (as Donny Most)
- Fonzie Drops In (1974) - Ralph Malph (as Donny Most)
- The Deadly Dares (1974) - Ralph Malph (as Donny Most)
- Hardware Jungle (1974) - Ralph Malph (as Donny Most)
- Guess Who's Coming to Visit (1974) - Ralph Malph (as Donny Most)
- Richie's Cup Runneth Over (1974) - Ralph Malph (as Donny Most)
- The Lemon (1974) - Ralph Malph (as Donny Most)
- All the Way (1974) - Ralph Malph (as Donny Most)