Doctor Who "Legend of the Sea Devils."

The story takes place in 1807 China and a little before piracy ended in this region.  Though some have said there's no pirates in the sense of the Caribbean.  This to me at least, did have some pangs of Pirates of the Caribbean At World's End movie.  Madame Ching (Crystal Yu) for one having her own ship.  The Sea Devil's ship was reminiscent of Davy Jones Locker and Pirates of the Caribbean Dead Man's Chest and taking over Ji-Huns ship not for the treasure but for the glowing keystone.  Also these Sea Devils reminded me of Corgis, their heads in particular.  Also the Doctor (Jodie Whittaker) and Yaz (Mandip Gill) dressing for the occasion where Dan (John Bishop) was made to dress like a pirate cos of Yaz.  In search of a beach (still) but they come across one before. They end up here in the murky depths (almost) of this land where they come across Madam Ching fighting with the son of the man who was just killed.  He says she killed him by releasing the devil in the rock, but she insists it wasn't her.

Anyway, they hear screaming and the Sea Devils are marauding the village, thus they try to help.  The Sea Devil (Craige Els) is in search of something and leaves by summoning his ship onto land.  (Shades of Pirates here, no?!)  He was the creature freed by Madam Ching as she is searching for treasure.  The lost treasure of the Flor de la Mar which Dan has heard of.  Yaz and the Doctor head below depths in    search of the location of the ship.  They find the Captain Ji-Hun (Arthur Lee) wants his crew to abandon ship not due to a mutiny but cos of the Sea Devil.  They leave.  However finding that the wreck isn't there, they find the bottom of the sea is disappearing.  Heading back inside the TARDIS, are swallowed by the large creature.  

Dan and the dead man's son, Ying Ki (Marlowe Chang-Reeves) sneak on board Ching's ship and she catches them using them as her crew.  After telling them she needs the treasure to save her crew and her two sons.  She fears she won't see them again.  The sea creature appears again and after throwing back their cannon balls to the ship, it disappears.  The Doctor and Yaz on the Sea Devil's ship come across Ji-Hun in some form of statis pod.  The Sea Devil finds out his keystone has been located and the Doctor doesn't have it.  Though she does tell him in the future his kind are friendly.  

The Doctor et al, miraculously escape somehow and are now on Madam Ching's ship where another battle ensues.  That's cos Ying-Ki has the keystone which belonged to his ancestors and was given to him by his mother.  The Sea Devil gets a hold of the keystone and the Doctor figures he's going to use it to flood the Earth.  A fight ensues with the other Devils and the Doctor saves herself from the Captain Sea Devil's sword using her sonic.  

She finds a way to destroy the Sea Devil's base and their plans but doesn't count on not being able to join the two cables together.  Oh what a cop out in having Ji-Hun step in.  Especially since it was a plot point also used in Village of the Angels with the professor, who was left behind with the Sontarans attacking.  However she had enough cloth on her outfit to actually tie the two cables together.  Also seemed she was hasty in letting him do the 'dirty' work by staying behind.  But had pangs of sorrowful regret when she bemoaned Ji-Hun killing a Sea Devil.  So look can't have it both ways.  Being a little more creative she could've saved Ji-Hun too and was a little not concerned with him dying after being in stasis for so long.  Although he volunteered.  Nope probably too preoccupied with Yaz, who selfishly was thinking of her herself and being with the Doctor.

Thus the Doctor having to let her down by saying it's not that she wouldn't want to be with her, on a date and all that.  But she can't.  Cos she once had a wife and can't go through that again.  Her way of letting Yaz down gently since she knows what's coming for her, re the Flux revelation.  All's well as Yaz and the Doctor end up skipping stones at the beach!  Anyhoo, this ep the Doctor didn't seem too overtly concerned with saving lives and all that and Yaz and her moping didn't help.  Eagerly we await the Doctor's demise, or rather Thirteen's and a regeneration with the Dalek's and the Master around...