Thomas' Adventures of Harry Potter and the Philosopher's Stone is the first Thomas & Friends/Harry Potter crossover film to be created by 76859Thomas and Sonic876. It will appear on Google Drive or Dropbox as part of a double feature with Thomas the Tank Engine Trapped in Vestroia (Special Short Film) in the near future.
Harry Potter is a seemingly ordinary boy living in Little Whinging, Surrey, England with his only remaining relatives, the Dursleys, who treat him badly. In 1991, after inadvertently causing an accident on a family outing and receiving several unsolicited letters by owl, Rubeus Hagrid appears and informs Harry that he is a wizard, known for being the first and only one to survive an attack by Lord Voldemort, a once-powerful dark wizard who terrorized the Wizarding World and murdered those who stood in his way, including Harry's parents James and Lily Potter. Hagrid reveals to Harry that he has been accepted into Hogwarts School of Witchcraft and Wizardry. After buying his school supplies from the hidden London street, Diagon Alley, Harry boards the train to Hogwarts via the concealed Platform 9¾ in King's Cross Station.
On the train, Harry meets Ron Weasley, a boy from a large but poor pure-blood wizarding family, and Hermione Granger, a witch born to non-magical parents. Once they arrive Harry and all the other first-year students are sorted between four houses: Gryffindor, Hufflepuff, Ravenclaw, and Slytherin. Because Slytherin is noted for being the house of darker wizards and witches, Harry convinces the Sorting Hat not to put him in Slytherin. He ends up in Gryffindor along with Ron and Hermione. Ron's older brothers were all placed in Gryffindor as well: mischievous twins Fred and George, Percy the prefect, Charlie (who researches dragons in Romania) and Bill (who works for Gringotts Bank).
At Hogwarts, Harry begins learning wizardry and discovers more about his past and his parents. He gets recruited for Gryffindor's Quidditch (a sport in the wizarding world where people fly on broomsticks) team as a Seeker, as his father was before him. One night he, Ron, and Hermione discover a large three-headed dog named Fluffy (owned by Hagrid) on a restricted floor in the school. They later find out Fluffy is guarding the Philosopher's Stone, an item that can be used to grant its owner immortality. Harry concludes that his potions teacher, the unfriendly Severus Snape, is trying to obtain the stone in order to return Voldemort to a human form.
After hearing from Hagrid that Fluffy will fall asleep if played music, Harry, Ron and Hermione decide to find the stone before Snape does. They face a series of tasks that are helping guard the stone which include surviving a deadly plant known as Devil's Snare, flying amidst winged, flying keys and winning a dangerous, life-sized game of chess.
After getting past the tasks Harry discovers that it was really Defence Against the Dark Arts teacher Professor Quirrell who was trying to steal the stone, and that Snape was protecting Harry all along. Quirrell removes his turban and reveals Voldemort to be living on the back of his head. Voldemort attempts to convince Harry to give him the stone (which Harry suddenly finds in his pocket as the result of an enchantment by the headmaster, Albus Dumbledore), by promising to bring his parents back from the dead, but Harry refuses. Quirrell attempts to kill him and take the stone, but Harry's touch turns Quirrell into dust. When Harry gets up, Voldemort's spirit rises from Quirrell's ashes and passes through Harry, knocking him unconscious before fleeing.
Harry wakes up in the school's hospital wing with Professor Dumbledore at his side. Dumbledore explains that the stone has been destroyed and that, despite Ron nearly being killed in the chess match, he and Hermione are both fine. The headmaster reveals that Harry was able to defeat Quirrell because when Harry's mother died to save him her death gave Harry a magical, love-based protection against Voldemort. Harry, Ron, and Hermione are rewarded with house points for their heroic performances, and Neville Longbottom is rewarded for bravely standing up to them, winning Gryffindor the House Cup. Before Harry and the rest of the students leave for the summer, Harry realises that while all other students are going home, Hogwarts is truly his home.
- Sooty, Sweep, Soo, Little Cousin Scampi, Annoying Orange, Pear, Apple, Passion Fruit, Midget Apple, Marshmallow, Grapefruit, Grandpa Lemon, Nerville, Princess Sapphire, Choppy, Prince Frank, Discord, Dumbo, Timothy Q. Mouse, Jim Crow and his Brothers, Mushu, Cri-Kee, Alex, Marty, Melman, Gloria, Jean-Bob, Speed, Puffin, Crysta, Batty Koda, Pips, The Beetle Boys, The Bakugan Battle Brawlers and their Bakugan, Tino Tonitini, Lor McQuarrie, Carver René Descartes, Tish Katsufrakis, The Rough Gang, Broccoli Alien Overload, Duke Duralumon, Baron Nylon, Rothbart, Ursula and Hades guest stars in this film.
- The Rough Gang, Broccoli Alien Overload, Duke Duralumon, Baron Nylon, Rothbart, Ursula and Hades will be working with Professor Quirrell.
- This film marks the first debut of The Bakugan Battle Brawlers and their Bakugan from Bakugan Battler Brawlers.
- This is Sonic876's first Thomas' Adventures project with 76859Thomas.
- This film takes place after Tino's Adventures of Thomas and the Magic Railroad (Which Tino and his friends already knows Thomas and his friends) and Tino's Adventures of My Little Pony: Friendship is Magic (Full Movie) (Which Tino and his friends already knows Twilight Sparkle and her friends).
- The storyline continues in Thomas' Adventures of Harry Potter and the Chamber of Secrets.