Sometimes actors are intentionally playing more than one character, like a twin, clone, relative, or alternate universe character. This list is all people who have come back as a completely different character for seemingly no reason.
  1. Mick and Kirk, Gilmore Girls
    Sean Gunn
  2. Frank Buffay Jr. and guy who asks Phoebe for a condom, Friends
    Giovanni Ribisi
  3. Tommen Baratheon and Martyn Lannister, Game of Thrones
    Dean-Charles Chapman
  4. Marty Crane and Sy Flembeck, Cheers/Frasier
    John Mahoney. These are different shows but it still counts because it all exists within the same universe.
  5. Twinks and Sparkie, the Mary Tyler Moore Show
    Pat Finley
  6. Blue man, Barbara Walters, Greta Johanssen, Maria, Elizabeth Taylor, Pamela Smew, Vlem, Martha Blanch, Dr. Beauvoir, Jadwiga, 30 Rock
    Rachel Dratch. Wasn't sure if I was going to include this or not since it's an intentional running gag, but I'll allow it.
  7. Drella and Miss Celine, Gilmore Girls
    Alex Borestein
  8. Nolan Rayburn and Young Danny Rayburn, Bloodline
    Owen Teague. Sorry, not a great pic.
  9. Andrea and Marcia Clark, Unbreakable Kimmy Schmidt
    Tina Fey
  10. Judge Carl Robertson and George Jefferson, the Fresh Prince of Bel Air
    Sherman Hemsley
  11. Nick and graphic design guy, the Office
    Nelson Franklin. Could only find the one pic.
  12. Seth Meyers and Matt, the Mindy Project
    Seth Meyers
  13. Vaughn Wysel and Jared, Sex and the City
    Justin Theroux