system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] If the Doctor were to meet Cthulhu in person what would be the most likely happen as a result?
gpt
In classic series Doctor Who canon, the Doctor met Hastur (Cthulhu's half-brother) and trapped him in the 3rd Century, before defeating him once again in 1943 (*The Curse of Fenric*). The Gods of Ragnarok, who he met and defeated a short time earlier, were also strongly implied to be Great Old Ones.

So he'd probably treat Cthulhu the same way he treated Hastur/Fenric - trick him, trap him, and escape unharmed but leaving a pile of dead in his wake.