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
    Static
    Sean Gunn
  2. Frank Buffay Jr. and guy who asks Phoebe for a condom, Friends
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    Giovanni Ribisi
  3. Tommen Baratheon and Martyn Lannister, Game of Thrones
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    Dean-Charles Chapman
  4. Marty Crane and Sy Flembeck, Cheers/Frasier
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    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
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    Pat Finley
  6. Blue man, Barbara Walters, Greta Johanssen, Maria, Elizabeth Taylor, Pamela Smew, Vlem, Martha Blanch, Dr. Beauvoir, Jadwiga, 30 Rock
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    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
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    Alex Borestein
  8. Nolan Rayburn and Young Danny Rayburn, Bloodline
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    Owen Teague. Sorry, not a great pic.
  9. Andrea and Marcia Clark, Unbreakable Kimmy Schmidt
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    Tina Fey
  10. Judge Carl Robertson and George Jefferson, the Fresh Prince of Bel Air
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    Sherman Hemsley
  11. Nick and graphic design guy, the Office
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    Nelson Franklin. Could only find the one pic.
  12. Seth Meyers and Matt, the Mindy Project
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    Seth Meyers
  13. Vaughn Wysel and Jared, Sex and the City
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    Justin Theroux