History Main / ImmortalGenius

->'''Dracula''': You would give your mortal life to preserve my immortal one?\\
'''Isaac''': To save your genius? Your knowledge, and your will? Without question. I am just a forgemaster. Yours is the wisdom of ages.

* ''Literature/TheFirstFifteenLivesOfHarryAugust''

* ''Literature/WarriorCats'': Rock and Midnight are an immortal cat/badger duo that appears to know everything worth knowing when it comes to the Clans, their history, and even their futures. Rock even has a BaldMystic appearance in cat form, and Midnight is an {{Omniglot}} who can speak multiple animal languages when only one other character in the work has been able to speak another animal language [[note]] Millie, who can speak dog [[/note]].

** The Infinites possess BornAgainImmortality, and thanks to their perfect memory of their past lives, have become experts in whatever field of study they put their mind to, hence why the Believers and the Nihilists have such incredible technology at their disposal. Even main character Evan [=McCauley=], despite having lost conscious access to his past memories due to past-life trauma, is a master blacksmith and can rattle of an unbelievable number of facts on any given subject without even thinking about it.

** The Doctor is virtually immortal thanks to their long (if unspecified) natural lifespan and their ability to regenerate into a new self after mortal injury (which, while limited to twelve iterations, has been renewed). They also possess knowledge relating to almost every conceivable field of science, culture, and history, proclaiming themselves a doctor "of everything". Part of this is due to being a super-intelligent alien, but also due to personal experience gleaned through time travel, plus the occasional stint in TheSlowPath; few Time Lords stray far from Gallifrey, so not many of them are as brilliant or as versatile as the Doctor.

*** Zig-zagged by the [[PuppeteerParasite Goa'uld]]. They can naturally live for centuries and expand their lifespans into immortality through use of [[ImmortalityInducer sarcophagi]]... but they're not as omniscient or as clever they'd like their worshippers to think. Their technology was just reverse-engineered Ancient tech, and the Goa'uld [[AwesomeButImpractical designed it to impress rather than function]]. Worse still, their gigantic egos and [[SanitySlippage brain-addling use of]] [[ToxicPhlebotinum the sarcophagi]] prevent them from acknowledging this. However, a rare few Goa'uld have escaped this stereotype to become genuinely inventive, brilliant, and extremely dangerous -- most notably [[BigBad Anubis]], who not only has [[TechnologicallyAdvancedFoe access to unique technical knowledge]], but is also [[TheDisembodied partially Ascended]] and has no need of a sarcophagus.

*** The Ori are also Ascended immortals... and have used their omniscience and technical knowledge to empower their worshippers into a vast army of crusaders equipped with incredibly advanced warships and led by genetically-augmented SuperpoweredMooks. In other words, they're what happens when [[EvilCounterpartRace the Ancients go horribly wrong]].
** ''Series/StargateAtlantis'': [[OurVampiresAreDifferent The Wraith]] are practically immortal so long as they continue to feed on other living beings. Of them, "[[NobleDemon Todd]]" has been alive for over ten thousand years and survived more tight scrapes than any other Wraith in the show. He's also [[GeniusBruiser the most intelligent and scientifically-minded of them]] -- to the point that when [=McKay=] desperately needs to hack a rogue swarm of nanites, [[EnemyMine he's ultimately forced to consult Todd for answers]].

** [[HumanoidAbomination Lilith]] was alive during the First Age, and has parlayed her in-depth experience with long-lost technology into a career as a scientist in the eons that followed -- on occasions when she wasn't making a name for herself as a monster or a goddess, of course. In fact, it's due to this incredible technological knowledge that she and her equally immortal husband [[FallenAngel Samael]] have built a respectable public life as [[spoiler: the heads of the [[MegaCorp Orochi Group]], recreating the LostTechnology of the Third Age to give their corporation its technological edge.]]
* In ''VideoGame/TheElderScrollsIVOblivion'', Knifepoint Hollow in the Shivering Isles is home to Dyus, the librarian of Order, who [[MadGod Sheogorath]], recognizing his usefulness despite belonging to his ArchEnemy Jyggalag, ordered to memorize the entire contents of a library whose books predicted every possible outcome of every event to the end of time, and then forbade to die. His otherwise lost knowledge is critical in the the expansion's main quest.