Under the Sea.

Under the Sea is the episode 32 of the season 22

Plot
The episode begins with Lady on the beach of Sodor pulling passengers, then realizes that the whole island is here, Lady teleports to Thomas and asks what happens, Thomas says that Vector has discovered a sub-aquatic way, and has modified to trains to go under water, Lady says it sounds good, then Sir Topham Hatt arrives and inaugurates the Sub-Aquatic Part of the North Western Railway (or PSANWR, for short), Thomas, Gordon, James and Hiro are the first to go, 3 days later, Edward is pulling a Goods Train, when suddenly he hears something strange, when he hears something he takes it to him and his Troublesome Trucks, 2 days later more trains have disappeared, Hatt sends Thomas, Percy and James to find out what's happening, the 3 divide when they reach the Sub-Aquatic, and Mavis and Stanley disappear, on the side of James, he also disappears, on the side of Thomas and Percy, Percy sees some tentacles like to those of Ursula, Thomas then they have Flashback in Quick Camera, and when the Flashback ends, Thomas sticks a Scream, Percy asks what happens but Thomas refuses to tell the truth, saying "Nothing, nothing at all, He He He" Then, when a metal arm he approaches Thomas, Thomas feels that right away and gives KO FULMINANTE, the arm approaches Percy and catches him, Thomas follows him and finds out that Diesel 10 is behind all this, by kidnapping the trains turn them into Pinchy's , this leads to an epic battle, in which Diesel 10 converts Percy and James into Pinchy 6 and Pinchy 5, and no longer needs the original Pinchy, therefore, the original Pinchy joins Thomas and defeats Diesel 10, Returning everyone to normal, Diesel 10 escapes, and Thomas tells Pinchy that he does not need him again, he knows who to leave with.

Trivia

 * This is the first episode that shows the ability of trains to go under water.