History Main / RequiredSpinoffCrossover

* HeMan would often show up on ''SheRaPrincessOfPower''.

* The first season of ''{{Yu-Gi-Oh GX}}'' easily bears the closest resemblance to the original ''{{Yu-Gi-Oh}}'' and even contains {{Shout Out}}s like Sho fantasizing that he and Judai are {{Reincarnation}}s of an Egyptian pharoah and high priest. From Season 2 onward, it steadily grew to more closely resemble, if anything, ''{{Evangelion}}''.

** DeForestKelly (Dr. [=McCoy=] from StarTrekTheOriginalSeries) showed up in the series premiere of TheNextGeneration as an extremely aged Admiral [=McCoy=].
** TheNextGeneration and DeepSpaceNine crossed-over for the ''Birthright'' two-parter.
** Quark from DeepSpaceNine appeared in season seven of TheNextGeneration; he was actually intended to be in a earlier TNG[=/=]DS9 crossover...until it was realized that episode would be airing ''before'' DS9's premiere and Quark was rewritten as a generic Ferengi.
** Deanna Troi and Reg Barclay from TheNextGeneration both had recurring roles on StarTrekVoyager.
** Finally, Jonathan Frakes appeared in all three spin-off series (as William Riker in {{Voyager}} and {{Enterprise}} and as Thomas Riker in DeepSpaceNine).
** Meaning Voyager was the only series that never got to pass the torch to the next one, since none of its characters ever showed up on {{Enterprise}}.
*** BUT, Jayneway got to make an appearance in StarTrekNemesis, which was a Next Generation movie. A torch passed back.

-->"''Hey, it's my old pals, the Simpsons! Why, what are the Simpsons doing in New Orleans?''"

* Done frequently with DoratheExplorer and it's spin off Go Diego Go.

** Done straight with Martha Jones showing up in ''Torchwood'', however. The Doctor would be a bit of a scene-stealer in that show, anyway.

** ''StargateUniverse'' has SG-1 characters turn up often ([[IsntItSad minus Teal'c, for some reason]]). O'Neill in particular is around more now than he was in the final seasons of his own series. The first season finale, involving SG-1 bad guys trying to reach the ''Destiny,'' is set to be as much an episode of SG-1 as SGU, if the episode that serves as prelude is any indication.

* Consciously averted with ''Joey'', the spin-off of ''{{Friends}}''.
** If only because it didn't last long enough for them to try.
*** But yes, the character moved from New York to L.A. so that the writers wouldn't have to explain why his best friends never visited him.

* Similar to the Law and Order examples above, ''{{CSI}}' occasionally does crossovers with its spinoffs. Aside from the pilot of one spinoff being an episode of a previous series, CSIMiami and CSINewYork crossed over once, and all three crossed over recently for a story involving human trafficking.
* HeMan would often show up on SheRaPrincessOfPower.

** DeForestKelly (Dr. Mc Coy from StarTrekTheOriginalSeries) showed up in the series premiere of TheNextGeneration as an extremely aged Admiral McCoy.

** Quark from DeepSpaceNune appeared in season seven of TheNextGeneration; he was actually intended to be in a earlier TNG[=/=]DS9 crossover...until it was realized that episode would be airing ''before'' DS9's premiere and Quark was rewritten as a generic Ferengi.

** De Forest Kelly (Doctor McCoy) showed up in the series premiere of TheNextGeneration as an extremely aged Admiral McCoy.

** TheNextGeneration and DeepSpaceNine also crossed-over for the ''Birthright'' two-parter.
*** Quark appeared in season seven; he was actually intended to be in a earlier TNG[=/=]DS9 crossover...until it was realized that episode would be airing ''before'' DS9's premiere and Quark was rewritten as a generic Ferengi.
** Also, Deanna Troi and Reg Barclay from TheNextGeneration both had recurring roles on StarTrekVoyager.

* The Laird's single appearance in ''[[{{ptitlecnamih8dscnb}} I'm Sorry I Haven't A Clue]]'' might qualify. The Laird was created for the sitcom version of Graeme and Barry's "Hamish and Dougal" skits and played by Jeremy Hardy. So when Jeremy stood in for Graeme as Barry's teammate, it only made sense to do a "Dougal and the Laird" skit.

** The ([[DavidTennant Tenth]]) Doctor appears in season three ("The Wedding of Sarah Jane Smith"). The [[MattSmith Eleventh]] will show up in season four, alongside another Classic Who companion, Jo Grant.

*** Quark appeared in season seven; he was actually intended to be in a earlier TNG/DS9 crossover...until it was realized that episode would be airing ''before'' DS9's premiere and Quark was rewritten as a generic Ferengi.
** Also, Deanna Troi and Reg Barclay from TheNextGeneration both had recurring roles on StarTrekVoyager
** Finally, Jonathan Frakes appeared in all three spin-off series (as William Riker in {{Voyager}} and {{Enterprise}} and as Thomas Riker in DeepSpaceNine)

* [[HerculesTheLegendaryJourney Hercules]] and {{Xena}} frequently crossed over into each other's shows.

* Intentionally avoided in ''{{Daria}}''. Early on, it was decided that the program would be too different a show from ''BeavisAndButthead'', and featuring characters from the previous series or explaining how Daria went from the locale of that series to the setting of ''Daria'' (aside from a throwaway line in the first episode about "uranium in the drinking water") would be confusing, misleading, and more likely to drive people off than attract them. Later on, they didn't do it simply because the show had become too established, and it would interrupt the flow and serve little purpose.
* [[AllInTheFamily Edith Bunker]] dropped by to visit [[TheJeffersons Louise Jefferson's]] deee-luxe apartment in the sky.

* Intentionally avoided in ''{{Daria}}''. Early on, it was decided that the program would be too different a show from ''BeavisAndButthead'', and featuring characters from the previous series or explaining how Daria went from the locale of that series to the setting of ''Daria'' (aside from a throwaway line in the first episode about "uranium in the drinking water") would be confusing, misleading, and more likely to drive people off than attract them. Later on, they didn't do it simply because the show had become too established, and it would interrupt the flow and serve little purpose.

* ''ToAruKagakuNoRailgun'''s spin-off protagonist Misaka Mikoto will (most of the time) run into the series protagonist [[{{ToAruMajutsunoIndex}} Touma Kamijo]]. And most of the time, Misaka WILL challenge Touma because of his [[{{AntiMagic}} Right hand]] cancelling her Railgun. YouShouldKnowThisAlready since this was shown in THE FIRST episode of the first season.

** The ([[DavidTennant Tenth]]) Doctor appears in season three ("The Wedding of Sarah Jane Smith").

* To Aru Kagaku no Railgun's spin-off protagonist Misaka Mikoto will (most of the time) run into the series protagonist [[{{ToAruMajutsunoIndex}} Touma Kamijo]]. And most of the time, Misaka WILL challenge Touma because of his [[{{AntiMagic}} Right hand]] cancelling her Railgun. YouShouldKnowThisAlready since this was shown in THE FIRST episode of the first season.

* Intentionally avoided in ''{{Daria}}''. Early on, it was decided that ''{{Daria}}'' would be too different a show from ''BeavisAndButthead'', and featuring characters from the previous series or explaining how Daria went from the locale of that series to the setting of ''Daria'' (aside from a throwaway line in the first episode about "uranium in the drinking water") would be confusing, misleading, and more likely to drive people off than attract them. Later on, they didn't do it simply because the show had become too established, and it would interrupt the flow and serve little purpose.

* Intentionally avoided in ''{{Daria}}''. Early on, it was decided that ''{{Daria}}'' would be too different a show from ''BeavisAndButthead'', and featuring characters from the previous series or explaining how Daria went from the locale of that series to the setting of ''Daria'' would be confusing, misleading, and more likely to drive people off than attract them. Later on, they didn't do it simply because the show had become too established, and it would interrupt the flow and serve little purpose.