* AscendedExtra: A real-life behind-the-scenes version. When the twin actresses who were supposed to play Tink's sisters couldn't make it, Felicia recruited one of their extras and used special effects to turn her into the twins we end up seeing in the show.
* HeyItsThatGuy!: Considering what a shoestring the series started on, the number of these it's wracked over the years is doubley impressive.
** Creator/WilWheaton plays Fawkes, leader of the Axis of Anarchy.
** The 2009 holiday sketches featured [[Series/{{Heroes}} James Kyson Lee]] and [[UglyBetty David]] [[Series/StargateUniverse Blue]].
** The end of season four has [[TheBigBangTheory Simon]] [[WebVideo/DoctorHorriblesSingalongBlog "Moist"]] [[TheBigBangTheory Helberg]] making a cameo as one of the Game Masters.
** Season 5 has more than everything else thus far put together.
*** [[Series/BuckRogersInTheTwentyFifthCentury Erin Gray]], unique for not [[TheCameo cameoing]] or AdamWesting as most of the below are, but as a NoCelebritiesWereHarmed version of Creator/ElisabethSladen.
*** [[Series/BattlestarGalacticaClassic Richard]] [[Series/BattlestarGalacticaReimagined Hatch]] also showed up.
*** Tony [[TheLegendOfNeil "Neil"]] Janning as the panel doorman that shoos away Zaboo
*** Tay Zonday of Chocolate Rain fame as himself
*** [[Series/StarTrekTheNextGeneration Brent Spiner]] and [[Series/MythBusters Grant Imahara]] as themselves.
*** NathanFillion!
*** Episode 7. [[NeilGaiman Neil Freaking Gaiman]]. That is all.
*** Episode 8 [[HerculesTheLegendaryJourneys Kevin]] [[Series/{{Andromeda}} Sorbo]], and an entire party's worth of people you vaguely recognise, including [[{{Chuck}} Zachary Levi]], [[Series/BuffyTheVampireSlayer Tom Lenk]], [[{{Eureka}} Colin Ferguson]], [[{{Dollhouse}} Dichen Lachman]], and ElizaDushku.
*** Episode 11. Wait a minute, is [[StanLee that...]] okay, now they're just showing off.
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