History Main / WrittenByCastMember

* Creator/TommyWiseau wrote the screenplay for ''Film/TheRoom'' and starred in it. He was also the [[DirectedByCastMember director]], executive producer, and [[ProducedByCastMember producer]]. [[ItsAllAboutMe All these credits for him are listed individually, resulting in his name being listed five times]].

* Creator/NicoleMaines, who playes Dreamer in ''Series/{{Supergirl}}'', wrote a Dreamer story for the 2021 ''DC Pride'' special, the first appearance of Nia in comics.

** Creator/IanMarter, who played Dr. Harry Sullivan, subsequently wrote nine of the Literature/DoctorWhoNovelisations, two of which ("[[Recap/DoctorWhoS12E2TheArkInSpace The Ark in Space]]" and "[[Recap/DoctorWhoS12E3TheSontaranExperiment The Sontaran Experiment]]") he had appeared in as Harry. Marter also wrote an entirely original novel featuring Harry as the protagonist, ''Harry Sullivan's War''. Marter and, with Creator/TomBaker, co-wrote a speculative script for a ''Doctor Who'' movie during their time together on the show, called ''Literature/DoctorWhoMeetsScratchman'', which eventually ended up as a novel called simply ''Scratchman'' -- as Marter had died in the meantime the novelisation was a collaboration between Baker and Whoniverse writer James Goss.

* Creator/RobMorrow co-wrote ''Film/{{Maze}}''.

* Creator/EdwardNorton reworked extensively the script for ''Film/TheIncredibleHulk'', but the Writer's Guild denied him credit.

** Creator/IanMarter, who played Dr. Harry Sullivan, subsequently wrote several of the Literature/DoctorWhoNovelisations, as well as an entirely original novel featuring Harry as the protagonist, ''Harry Sullivan's War''. Marter and Creator/TomBaker co-wrote a speculative script for a ''Doctor Who'' movie during their time together on the show, called ''Literature/DoctorWhoMeetsScratchman'', which eventually ended up as a novel called simply ''Scratchman'' -- as Marter had died in the meantime the novelisation was a collaboration between Baker and Whoniverse writer James Goss.

* Sonia Manzano has played Maria on ''Series/SesameStreet'' since 1971 and has written for the show since 1981.

** "Trapped" was co-written by Creator/RickJones, who voiced Puffball. Slightly inverted in that Rick also has writing credits for several other Canadian shows.

* The ''Film/BloodAndIceCreamTrilogy'' are all co-written by star Creator/SimonPegg.

* Creator/DanCastellaneta has so far written eight episodes of ''WesternAnimation/TheSimpsons'' with [[CreatorCouple his wife]] Deb Lacusta ("Days Of Wine And D'oh'ses"[[note]]season 11 episode where Barney gives up drinking and Bart and Lisa try and look for the perfect photograph for the town's phone book contest[[/note]], "Gump Roast"[[note]]the final clip show episode from season 13 where Homer is honored at the Friars' Club with a roast[[/note]], "The Ziff Who Came To Dinner,"[[note]]season fifteen episode where Artie Ziff hides out at the Simpson house after his business goes under and he's being hounded for cheating his shareholders[[/note]] "Kiss Kiss Bang Bangalore,"[[note]]season seventeen episode where Homer goes to India after Mr. Burns outsources the nuclear plant while Patty and Selma kidnap Richard Dean Anderson after he tells them that he only did ''Series/{{MacGyver|1985}}'' to earn a paycheck[[/note]] "The Fight Before Christmas,"[[note]]a bizarre ChristmasEpisode that had an ''Inglorious Basterds'' parody, Martha Stewart showing Marge the true meaning of Christmas, and Music/KatyPerry as the only human in a piece that has The Simpsons as Muppets[[/note]] "A Midsummer's Nice Dream,"[[note]]the episode where stoner comedians Cheech and Chong break up and use Homer and Principal Skinner as their new comedy partners while Marge tries to help the Crazy Cat Lady with her hoarding problem[[/note]], "The Ten-Per-Cent Solution"[[note]]the episode where Krusty's show gets canceled again and Joan Rivers voices his first agent, who helps him revive his career with a cable show[[/note]], and most recently "Havana Wild Weekend"[[note]]in which the Simpsons take Grandpa to Cuba for cheaper health care, and he wants to stay there upon being reinvigorated by nostalgia[[/note]]).
** He also co-wrote at least one sketch of ''Series/TheTraceyUllmanShow''.
** Despite Guest Star Creator/RickyGervais getting credit for writing the season 17 episode, ''[[Recap/TheSimpsonsS17E15HomerSimpsonThisIsYourWife Homer Simpson, This Is Your Wife]]'', he admits that he didn't really write much of it. He said that he only wrote the plot (which was his wife's idea), a couple of jokes and the song.
** Guest star Creator/SethRogen co-wrote the episode "Homer The Whopper".
** Creator/HarryShearer, who voices Ned Flanders, Mr. Burns, Smithers, Principal Skinner, etc. wrote a season 28 episode "Trust but Clarify".
** Creator/NancyCartwright, voice actress of Bart, Ralph, Nelson, etc. wrote the season 30 episode "Girl's in the Band".

* One episode of ''WesternAnimation/SonicBoom'', titled ''[[Recap/SonicBoomS2E20GiveBeesAChance Give Bees A Chance]]'', was written by Creator/CindyRobinson (Amy's voice actress).

* ''WesternAnimation/LegendOfTheThreeCaballeros'': Creator/TonyAnselmo has voiced Donald for so long, Creator/MattDanner [[https://mobile.twitter.com/MattyDanner/status/1195843092588322817 had him work as a consultant in each episode]] in order to make sure he was portrayed as accurately as possible.

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* A couple of ''Series/{{CSINY}}'' cast members tried their hand at writing episodes. Creator/GarySinise worked on the story line for "Live or Let Die" about a stolen liver, and wrote the screenplay for "Turbulence" in which a man posing as an Air Marshall is killed during a flight that Mac is on. Creator/MelinaKanakaredes wrote "Grounds for Deception" where Stella goes to Greece chasing a suspect - an ep which unfortunately drew mixed reviews from fans.

* Creator/ColinBaker wrote ''The Age of Chaos'', a graphic novella featuring his Sixth Doctor, which is also something of a FixFic for [[spoiler:Peri's EsotericHappyEnding]].

* Creator/PaulRudd co-wrote ''Film/RoleModels'', ''Film/AntMan'' and ''Film/AntManAndTheWasp''.

** "Trapped" was co-written by Rick Jones, who voiced Puffball. Slightly inverted in that Rick also has writing credits for several other Canadian shows.

* Creator/NicoleMaines, who playes Dreamer in ''Series/{{Supergirl}}'', wrote a Dreamer story for the 2012 ''DC Pride'' special, the first appearance of Nia in comics.

* Camrus Johnson, who plays Luke Fox in ''Series/{{Batwoman}}'', wrote a Batwing story for ''Batman: Urban Legends'' #4. The issue was released the same day that the ''Batwoman'' episode where he dons the Batwing suit was broadcast.

* Creator/DannyDeVito wrote a Penguin story for ''Gotham City Villains Anniversary Giant'', having played Cobblepot back in ''Film/BatmanReturns.
* Creator/GilbertGottfried, who played a villain named Nick Nack in the ''Series/{{Superboy}}'' TV series, wrote an issue of the tie-in comic detailing the character's origin story.
* Nicole Maines, who playes Dreamer in ''Series/{{Supergirl}}'', wrote a Dreamer story for the 2012 ''DC Pride'' special, the first appearance of Nia in comics.

* The ''WesternAnimation/MuppetBabies2018'' episode "Grandpa Camp" was co-written by Matt Danner, the voices of Kermit, Waldorf, and Beaker.

* Though the 200th episode of ''WesternAnimation/MyLittlePonyFriendshipIsMagic'', "[[Recap/MyLittlePonyFriendshipIsMagicS9E4SparklesSeven Sparkle's Seven]]", is written by Nicole Dubuc and Josh Haber, the story itself was conceived by Creator/TaraStrong (Twilight Sparkle), Creator/AshleighBall (Applejack and Rainbow Dash), Creator/AndreaLibman (Fluttershy and Pinkie Pie), Creator/TabithaStGermain (Rarity), and Creator/CathyWeseluck (Spike), combining story ideas they've wanted to do with their respective characters for years.

** They later co-wrote and played in ''Film/TheLastDuel''.

** Creator/IanMarter, who played Dr. Harry Sullivan, subsequently wrote several of the Literature/DoctorWhoNovelisations, as well as an entirely original novel featuring Harry as the protagonist, ''Harry Sullivan's War''. Marter and Creator/TomBaker co-wrote a speculative script for a ''Doctor Who'' movie during their time together on the show, called ''Literature/DoctorWhoMeetsScratchman'', which eventually ended up as a novel called simply ''Scratchman'' -- as Marter had died in the meantime the novelisation was a collaboration with Whoniverse writer James Goss.