First of all, thank you very much for the compliment. Though I feel like what I wrote starts to look pathetic when you bring out the Lovecraft. :)
The only way that Cthulhu is continuing to exist would be if he was God-tier. As in, Marvel's One Above All. I'm not completely sure what to make of the whole dead/alive situation, except for the fact that Cthulhu doesn't live when the stars are wrong, and the Doctor has been shown to be able to destroy stars on a whim. So this would stop Cthulhu from being alive, but he wouldn't be dead either. I don't know if this counts as a win for the Doctor, but I'd say it probably does.
And I don't know how literally to take this if it's simply the description of Cthulhu from another character.
Also (and it's been a while since I read it so forgive me if I'm wrong,) wasn't Cthulhu KO'd by someone driving a boat into his head? If so, the Doctor can definitely just fly the TARDIS into his head and KO him, which counts as a win by CV rules. I'm enjoying this cosmic level conversation, but I'm not even sure if it's relevant given that Cthulhu was temporarily beaten by a guy with a boat.
This depends on what Lovecraft actually means with the phrase "when the stars align". Does this mean that a certain set of stars must align for Cthulhu to awake from his death/slumber? Or does it mean that "when the time is right" or "when a certain/specific situation arises"?
It's hard to say from the limited knowledge we do have about Lovecraft's Cthulhu.
It is also true that the description of Cthulhu is hard to differenciate from Lovecraft himself, the narrator or a character within the Lovecraftian universe.
Well, you're not entirely wrong per se., but you're not correct either. The problem with short stories or fiction, is that we can't simply post pictures or feats to determine a creature/beings powers or abilities. It's all up to interpretation, which perhaps makes the whole discussion folly in the first place. But it's still interesting to discuss either way - because rumors and previous statements can be faulty, like the boat incident with Cthulhu.
Johanson, the Norwegian character in Call of Cthulhu does in fact ram a Yacht into some larger beings head as he tries to escape. What most people leave out though, is that the attempt at killing the creature failed - and the creature regenerates rapidly afterwards; leaving the attempt futile.
What is interesting though, is that it is never stated anywhere that this was Cthulhu himself. The description of the being isn't entirely similar, where many a Lovecraftianarian has argued that this is simply a Shoggoth, the "builders" in the Cthulhu mythos. They can be interpreted as quite similar to Cthulhu - but the description of the creature in Call of Cthulhu is more akin to the Shoggoth than Cthulhu himself in the boat-scene.
Furthermore, the creature Johanson attacks with the Yacht is the result of a failed summoning by a then deceased group of cultists. This is important to note, because that means if the creature was in fact Cthulhu, it wasn't "even his final form". What differenciates a full fledged Cthulhu and a partly-summoned Cthulhu - or even just a Shoggoth?
@yuber: Show me feats for Cthulhu, not character statements.
Feats from a 1926 short story? This isn't a comic book, good sir. Character statements are all we have. I'm ignoring fanfiction here. Based on what Lovecraft does say about Cthulhu, he's far too much for the good Doctor Tim the Toolman to handle.
Still, we have to take what Lovecraft himself has told of Cthulhu to discuss the matter at hand - and Lovecraft tells us that:
These Great Old Ones, Castro continued, were not composed altogether of flesh and blood. They had shape — for did not this star-fashioned image prove it? — but that shape was not made of matter. When the stars were right, They could plunge from world to world through the sky; but when the stars were wrong, They could not live. But although They no longer lived, They would never really die...
“They worshipped, so they said, the Great Old Ones who lived ages before there were any men, and who came to the young world out of the sky. Those Old Ones were gone now, inside the earth and under the sea; but their dead bodies had told their secrets in dreams to the first men, who formed a cult which had never died. This was that cult, and the prisoners said it had always existed and always would exist, hidden in distant wastes and dark places all over the world until the time when the great priest Cthulhu, from his dark house in the mighty city of R'lyeh under the waters, should rise and bring the earth again beneath his sway.”
“Children will always be afraid of the dark, and men with minds sensitive to hereditary impulse will always tremble at the thought of the hidden and fathomless worlds of strange life which may pulsate in the gulfs beyond the stars, or press hideously upon our own globe in unholy dimensions which only the dead and the moonstruck can glimpse.”
Cthulhu is a being that is dead and alive - he functions between what is real and what is not real. Even if the universe, multiverse or any -verse beyond our own comprehension did or did not exist, there still would be Cthulhu.
It doesn't matter because of one simple line, as stated above: Cthulhu's very existence is beyond our comprehension. That means that we cannot even hope to fathom how he can be destroyed. We can grasp and comprehend how the doctor functions, thus he is beneath what we cannot understand or even hope to understand. Argue if you want to, but this one goes to Cthulhu.