All 54 actors in both ER and That '70s Show
54 actors have appeared in both ER and That '70s Show, across 531 episodes. The most-credited is Megalyn Echikunwoke, Terry Welch in ER and Angie Barnett in That '70s Show.
| Actor | In ER | In That '70s Show | Eps | Eps |
|---|---|---|---|---|
| Megalyn Echikunwoke | Terry Welch | Angie Barnett | 1 | 8 |
| Cynthia LaMontagne | Paula McKenzie | Rhonda | 1 | 6 |
| Howard Hesseman | Dr. James Broderick | Max | 1 | 3 |
| Jeff Doucette | Larkowski | Dale | 1 | 3 |
| Paul Kreppel | Mr. Cotmeier | Jack Burkhart | 1 | 3 |
| Robert Clendenin | Anesthesiologist | Earl Arthur | 1 | 3 |
| Connie Sawyer | Kathy Brennan, Second Old Lady | Aunt Pearl | 2 | 1 |
| Mark Ankeny | Electrician | Cameraman, Pharmacist | 1 | 2 |
| Mark Bramhall | Weisner | Principal Pridwell | 1 | 2 |
| Tom Bosley | Walter Nikolaides | Dr. Hammond | 2 | 1 |
| Tom Poston | Earl | Burt Sigurdson | 2 | 3 |
| David Joyner | Dialysis Tech | Jazz Musician | 3 | 1 |
| Keri Lynn Pratt | Audrey Hoffman | Tiffany | 1 | 1 |
| Scott Haven | P.K. Palmer IV | Cop | 1 | 1 |
| Carol Ann Susi | Mrs. Clark | Receptionist | 1 | 2 |
| Jackie Debatin | Judy | Sunshine | 1 | 2 |
| Tommy Hinkley | Mr. Ellis | Cop | 2 | 1 |
| Don Perry | Dr. Stan Breedlove | Ed, Older Man | 2 | 2 |
| Alex Nevil | Mr. Dorset | Waiter #2 | 1 | 1 |
| Lisa Arning | Nikki | Cheerleader, Jeri | 1 | 2 |
| Mitch Pileggi | Terry Waters | Bull | 1 | 1 |
| Myra Turley | Monica Ford | Woman | 1 | 1 |
| Nancy Lenehan | Edie Harvell | Nina's Mom | 1 | 1 |
| Richard Kline | Arnie Nadler | Ted | 1 | 1 |
| Stacy Barnhisel | Nancy | Rally Leader | 1 | 1 |
| Wayne Péré | Eric Farve | Randy | 1 | 1 |
| Suanne Spoke | Mrs. Robbins, OB Receptionist | Iris | 2 | 1 |
| Alexandra Lee | Katie | Kid #2 | 1 | 1 |
| Bobcat Goldthwait | Mr. Conally | Eli | 1 | 1 |
| Francis Guinan | Police Negotiator | John Kelso | 1 | 1 |
| Jordan Orr | Thomas | Boy | 1 | 1 |
| Sam McMurray | Mike Landry | Larry | 1 | 1 |
| Steffani Brass | Shelly Burke | Colette / Little Jackie | 1 | 1 |
| Tom Kiesche | Officer Monroe | Mr. Romine | 1 | 1 |
| Chancellor Miller | Brett | Little Boy | 1 | 1 |
| Pat Skipper | Carl Dayton | Marty Forman | 1 | 1 |
| Paul Butcher | Paul Dressler | Young Boy #2 | 1 | 1 |
| Sandra DeNise | Molly | Lucy | 1 | 1 |
| Shannon Holt | Helen Palsey | Rebecca Erdman | 1 | 1 |
| Cheryl White | Meryl Sites | Mrs. Anderson | 1 | 1 |
| Earl Houston Bullock | Thorpe | Funeral Director | 1 | 1 |
| Todd Duffey | Mitch | Guy #2 | 1 | 1 |
| Dave Power | Jeremy Cranston | Big Marine | 1 | 1 |
| Drew Ebersole | Rick | Waiter | 1 | 1 |
| Morgan Nagler | Natalie Logan | Ticket Girl | 1 | 1 |
| Ryan Bumcrot | Baseball Player | Chet | 1 | 1 |
| Ben Ziff | Trevor | Guy | 1 | 1 |
| Joey Hiott | Ian | Kelso at 7 | 1 | 1 |
| Kevin McClatchy | Fred Danziger | Man #1 | 1 | 1 |
| Christopher Darga | Wilson | Transportation Rep | 1 | 1 |
| Jerry Hauck | Umpire | Vet Rep | 1 | 1 |
| Katya Abelski | Christy | Jackie at 6 | 1 | 1 |
| Sally Ann Brooks | Allison | Sally | 1 | 1 |
| Reagan Gomez-Preston | Gayla | Melissa | 1 | 1 |
Cast data from TVmaze, licensed CC BY-SA 4.0.