''Wizards vs. Aliens'', a CBBC ScienceFantasy series for children from Creator/RussellTDavies and Creator/PhilFord. The premise is ExactlyWhatItSaysOnTheTin. The evil Nekross, who eat magic, have come to Earth, the last place in the universe where their foodstuff still exists. They are opposed by young wizard Tom, his {{Muggle}} friend Benny, and Tom's eccentric grandmother Ursula.

The series has a bittersweet genesis. It was initially intended as a six episode "replacement" series to air instead of ''Series/TheSarahJaneAdventures'' while Creator/ElisabethSladen, who played Sarah Jane, recovered from cancer. After [[ActorExistenceFailure her death]], it served as its SpiritualSuccessor. The Series 2 episode "The Thirteenth Floor" originated as an unproduced script for ''Sarah Jane Adventures'', never made because of the cancellation of the series.

Three series have been made so far, with the show currently on hiatus due to budgeting issues.
!!This show provides examples of:
* AdiposeRex: The Nekross King. We only ever see his gigantic head.
%%* BadassGay: Benny
* CatchPhrase: "''THE NEKROSS SHALL FEAST!!!''"
* CoDragons: Varg and Lexi often play this role to their father, the Nekross King, though not strictly heirarchally - there are others of more authority and political power under him, so the siblings are generally ThoseTwoBadGuys and TheHeavy more of the time. [[spoiler:Lexi's apparent HeelFaceTurn in the Season 2 finale has uplifted this though.]]
* CoveredInGunge: Aliens that explode in showers of orange goo when killed? Check.
* DarkerAndEdgier: This show might be geared towards children, but the tone is positively ''bleak'' at times (see DownerEnding below) and can be shockingly frightening with high stakes each story arc. Notable because the show it follows in the footsteps of, ''Series/TheSarahJaneAdventures'', could also get similarly gritty tonally and make a mess of one's emotions, but this one takes it further with more adult themes and even ''less'' restraint in leaving the audience feeling broken down (though admittedly one of the stories, ''The Thirteenth Floor'', was originally an SJA story before being rewritten to fit into this universe and setting). It also has a more continuous StoryArc with the Nekross always being present, as opposed to the MonsterOfTheWeek stories of the other show (though it had story arcs of its own, they were looser and the two-parters were more self-contained aside from some recurring villains and Foreshadowing).
* DownerEnding: Stories such as ''100 Wizards'' and ''The Thirteenth Floor'' must be viewed with tissues at hand. [[spoiler:The latter's depressing ending is later rectified in the next story, with Tom and Lexi's memories of the 20 years they spent in the Neverway being restored, and then the Season Finale gives Tom the power to fix it completely - he saves Lexi's life by ''truly'' making her human, and he brings their son, Benny Junior, back into existence. So the original Downer becomes, by all appearances, an EarnYourHappyEnding for Lexi and her son, though it's unclear about their presence in Tom's life (as he's still fighting the Nekross and [[AmbiguousSituation might be keeping his distance to protect them]]... making it a BittersweetEnding at the ''worst''.)]]
* EnemyMine: The heroes and Varg team up after Tom and Lexi are kidnapped:
--> '''[[Creator/BrianBlessed Nekross King]]:''' A COALITION?!?
--> '''Varg:''' [[WhatDoYouMeanItsNotPolitical That will end, as all coalitions must]].
* EnergyAbsorption: The Nekross can't be harmed by magic; rather, they feed on it.
* ExtraLongEpisode: Season 3 opened with its first two episodes joined together, as opposed to being broadcast separately.
* FantasticRacism: The Nekross seem to share the prejudices humans suffer from concerning skin color. [[spoiler:The orange-skinned royal Varg, upon finding out the red-skin Jathro is the son of the white skin Kooth, brands it as 'blasphemy'. Benny rhetorically asks what's wrong with it.]]
* InsistentTerminology:
** Tom is a ''wizard'', not a magician.
** Randal Moon is a ''hob''goblin.
** It's ''[[BlackMagic Grim]]'' [[BlackMagic Magic]].
* InterspeciesRomance: [[spoiler:Tom and Lexi. They go all the way in one story.]]
%%* KillerRabbit: The Grazlak.
* LargeHam: Given that the King of the Nekross is voiced by Creator/BrianBlessed, it's only to be expected.
* {{Mana}}: Wizards can cast at most three spells in a day...
* PortalDoor: With the appropriate incantations, the door that normally leads to Ursula's downstairs lavatory gives access to her magical chamber.
* RapidAging: The draining of a wizard's magic causes them to age until they are old and decripit, implicitly giving it the appearance of [[NightmareFuel their life force being sapped from them until they've no life left to live]].
* RegeneratingMana: A wizard's magic is recharged at sunrise.
* RhymesOnADime: The Hobbledehoy can only speak in rhyme (all the time!) and can only understand people who do the same (isn't that lame?) The characters find it a challenge to come up with rhymes off the top of their heads!
* RuleOfThree: Magic runs on it.
* SpiritualSuccessor: To ''Series/TheSarahJaneAdventures'', as the series was produced after [[ActorExistenceFailure Sarah Jane's actress passed away]]. One storyline, "The Thirteenth Floor", was adapted from an unfilmed ''Sarah Jane'' script and many behind-the-scenes personnel were carried over. WordOfGod is that the series was commissioned when it became known that ''Sarah Jane'' star Elisabeth Sladen's health was going to delay production of her show; it became a permanent replacement when Sladen died and the BBC retired ''SJA''.
* StockUnsolvedMysteries: In the "The Cave of Menla-Gto" episode, Moon mentions that the Great Fire of London was caused by a dragon who thought that there were actual puddings in Pudding Lane.
* TeleportInterdiction: Magical teleportation can't breach the hull of the Nekross' ship. Justified, since they feed on magic.
* TonightSomeoneKisses: [[spoiler: Tom and Lexi in "The Thirteenth Floor".]]