While crossover episode might be a telecasting raw material , the bad of these cringe - worthy outings could go out viewers rushing to change the channel . Long before there were cinematic universes , interlinking multiverses , and argument about canyon events , the crossover episode was one of television ’s other foray into meta - storytelling . Even though connection idiot box is ( typically ) opposed to risky storytelling scheme , many show were willing to make an exclusion when it came to crosswalk episodes . It is not hard to see why , as crossing over episodes allowed networks to advertise one show while viewer were see another .

Whiletelevision ’s celebrity cameoswere often simple paygrade grabs , crossover case were a little bite smarter . These cultural moments reserve the two show to encourage each other at the same time by introducing viewers to their characters . If someone who had never pick up ofBrooklyn Nine - Ninetuned in toNew Girl ’s crossover installment with the sitcom , this could theoretically boost the show ’s viewership . Similarly , if a longtimeBrooklyn Nine - Nineviewer has never givenNew Girla chance , this in - universe innovation to the show ’s cast might obligate them to do so . However , the worst crossover episodes were not so lucky when it come to winning over new viewers .

10Jessie/ Ultimate Spider-Man

The first and most important thing that a successful crosswalk instalment needs is a uniform flavor . Both shows must feel at least superficially alike for their crossover voter to turn well . As such , when the child ’s sitcomJessiecrossed over withUltimate Spider - Man , thing ended in disaster . Admittedly , Ultimate Spider - Man ’s animated version of Spider - Manwas light-colored than many iterations of the franchise . However , it was n’t as poorly sweet asJessie , a sitcom wherein a New York nanny looked after some rich small fry . This inexplicably crossover amaze even more perplexing when the episode entangle Disney Channel sitcoms up in Marvel canyon .

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9Roseanne/ Absolutely Fabulous

WhileRoseanneand the British seriesAbsolutely Fabulousare both classic sitcoms , that is about all they have in mutual . Roseannewas a surprisingly grounded look at working - form family lifetime in ninety America , whileAbsolutely Fabulouswas a deliriously campy British comedy about a span of hard - crapulence , wild - living company animate being . The strife between the shows became sorely obvious when Edina and Patsy awkwardly play Roseanne inRoseanneseason 9 , instalment 7 , “ Satan Darling . ” The pairing was a fizzle and provedRoseanne ’s passing from the showshould have add up sooner .

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8Bones/ Family Guy

Boneswas a crime adjective series about an anthropologist and an FBI broker who team up up to solve crimes but can never quite solve their simmering sexual tautness . The tincture ofBoneswas a little silly than the likes ofCSIorNCISbut nearer to these hits than an outright dramedy likePushing Daisies . As such , it make out as a shock when Booth , one of the grinder ofBones , hallucinate a full - flub conversation withFamily Guy ’s Stewie Griffin in a ill-conceived cameo . The most baffling of the series comes inBonesseason 4 , episode 25 , “ The Critic and the Cabernet . ”

7Full House/ Family Matters

Family Mattersstar Steve Urkel seem inFull Houseseason 4 , episode 16 , “ Stephanie Gets Framed , ” in an utterly inexplicable cameo . When Stephanie Tanner got glasses , she understandably need reassurance that this would not change how mass viewed her . Steve Urkel , tv set ’s most iconic nerd , was just about the worst possible mortal conceivable to tell her that deoxyephedrine do n’t make someone a dork . However , this did not stop him from doing just that in an ungainly , misjudged cameo appearance .

6Boy Meets World/ Sabrina The Teenage Witch

Years afterSabrina The Teenage Witchended , The Chilling Adventures of Sabrinapulled off an efficaciously trippy crossover by revealing that the show had existed in the same universe as its light predecessor all along . However , Sabrina The Teenage Witch ’s crossover episode withBoy Meets Worldwas not quite so clever . Eric and Sabrina ’s date add up up in full term of character history . Sabrina ’s big cat Salem sending Cory and Topanga back to World War II was a lot less easy to justify .

5St Elsewhere/ Homicide: Life on the Street

The medical dramaSt Elsewherecrossed over with the crime dramaHomicide : lifespan on the Streetin a relatively self-coloured episode . Homicide : Life on the Streetseason 6 , sequence 16 , “ Mercy , ” would most in all likelihood be known only for Alfre Woodward ’s guest show if it were n’t forSt Elsewhere ’s ending . However , when this twist bring out thatSt Elsewhereexisted only in the mind of Tommy Westphall , this mean that , by extension , so did Homicide : living on the Street . AndThe X - Files , which crossed over withHomicide : spirit on the Streets . AndThe Simpsons , which crossed over withThe 10 - Files , and so on ad nauseam .

4Magnum PI/ Murder She Wrote

BothMagnum PIandMurder She Wroteare abstemious - hearted criminal offense procedurals , but that is where the similarity between the two shows end . The two secret serial could n’t have been less like , which made their crossover a bizarre matter . execution She Wroteseason 3 , sequence 8 , “ Magnum On Ice , ” is a charmingly ridiculous romp , but the jaunt does n’t make a lick of sensation and might be too airheaded even for fan of both shows .

3Doctor Who/ Eastenders

To be fair toDoctor Who ’s infamousEastenderscrossover , the episode was at least represent for charity . However , this did not make the sashay any less phantasmagorical as a viewing experience . For longtime viewers of the soap operaEastenders , its usual kitchen - sink realism was suddenly replaced by rubber - faced aliens and time locomotion . Meanwhile , for faithfulDoctor Whoviewers , there was an fearsome spate of domesticated squabbling and spirited dramatics to wade through between the major planet - hop adventures .

2Fresh Prince Of Bel Air/ Blossom

WhileThe Fresh Prince of Bel - Airwas a popular situation comedy , the show was not above engaging in some pretty transparent ploys for ratings . Donald Trump ’s ill-famed cameo is evidence of this , as isBlossomseason 2 , episode 4 , “ I ’m With the Band . ” In this outing of the kinfolk sitcom , Will Smith awkwardly appear as the Fresh Prince in a crowbarred - in cameo that is mean to promote the character ’s series . While far from organic , this appearing is at least mercifully abbreviated .

1Seinfeld/ Mad About You

disturbed About Youseason 1 , instalment 8 , “ The Apartment , ” scandalise viewers when the show confirm that the sitcom look at place in the same universe asSeinfeld . Returning to the honest-to-goodness apartment that he was sublease , Paul was surprised to divulge that its new resident was Seinfeld ’s wacky neighbor Kramer . This all seemed okay until a former instalment ofSeinfeldfeatured a subplot where George resented that his lady friend insisted on watchingMad About You . Things only grew more perplexing whenMad About Youlater boast an episode where Paul walked into the “ genuine ” Jerry Seinfeld rather than his fictionalized show counterpart .

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Star Wars Stormtrooper

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Bones, Family Guy crossover and the Full House and Family Matters crossover

Debby Ryan talking to the camera in Jessie

Joanna Lumley in Absolutely Fabulous

Booth and Brennan blue jacket Season 9 Bones Cropped

Steve Urkel from Family Matters wearing suspenders and glasses, in mid-sentence.

Hilda, Sabrina and Zelda in a promo photo for Sabrina, the Teenage Witch.

The cast of St Elsewhere

Magnum and Jessica Fletcher walking together in Murder, She Wrote.

A promo image of the cast from EastEnders. in front of a city

Will Smith talking to Uncle Phil (James Avery) in The Fresh Prince of Bel-Air

Seinfeld series finale episode