Labyrinth (1985) is a classic musical fantasy film directed by Jim Henson and starring David Bowie as Jareth, the Goblin King, and Jennifer Connelly as Sarah, a teenage girl who wishes her baby brother away. But what if the Tenth Doctor, the charismatic Time Lord from Doctor Who, played by David Tennant, was part of the story? How would he change the course of events and the fate of the characters? Here is one possible plot summary:
Sarah is a bored and rebellious teenager who loves to read fantasy books and act out scenes from them. She is annoyed by her stepmother and her baby half-brother Toby, who cries all the time and takes away her attention. One night, she wishes that the goblins would take Toby away, and to her horror, they do. She is confronted by Jareth, the Goblin King, who tells her that he has taken Toby to his castle in the center of a vast and magical labyrinth. He gives her 13 hours to solve the labyrinth and rescue Toby, or he will turn him into a goblin forever.
Sarah enters the labyrinth and meets various strange and wonderful creatures, some of whom help her and some of whom hinder her. She also encounters the Tenth Doctor, who has arrived in his TARDIS to investigate a temporal anomaly caused by Jareth's magic. The Doctor decides to help Sarah, as he is intrigued by her courage and imagination. He also warns her that Jareth is not to be trusted, as he has a dark and twisted side.
Together, Sarah and the Doctor face many challenges and dangers in the labyrinth, such as riddles, traps, illusions, monsters, and Jareth's minions. They also develop a friendship and learn from each other. Sarah realizes that she has been selfish and immature, and that she needs to grow up and take responsibility for her actions. The Doctor realizes that he has been lonely and reckless, and that he needs to find someone who can share his adventures and his life.
As they approach the castle, Jareth tries to tempt Sarah with his power and charm. He offers to make her dreams come true, if she will only forget about Toby and stay with him. He also tries to sabotage Sarah and the Doctor's relationship, by making them doubt each other's motives and feelings. He reveals that he has fallen in love with Sarah, but that he is also afraid of losing his control over the labyrinth and the goblins.
Sarah rejects Jareth's offer, as she has come to care for Toby and the Doctor more than anything else. She also tells Jareth that he can be more than a cruel and lonely king, if he will only let go of his fear and pride. The Doctor supports Sarah's decision, and tells Jareth that he can still change his ways and redeem himself.
Jareth becomes enraged and transforms into a giant owl. He attacks Sarah and the Doctor, who manage to evade him and reach the castle. There, they find Toby in a nursery surrounded by goblins. Sarah confronts Jareth one last time, and tells him that he has no power over her. She recites the final line of her favorite book: "You have no power over me." Jareth realizes that he has lost, and disappears with a cry.
Sarah hugs Toby and thanks the Doctor for his help. The Doctor tells her that he is proud of her, and that he will miss her. He invites her to join him in his travels across time and space, but she declines. She tells him that she needs to stay with her family and friends, but that she will always remember him. They share a hug and a kiss, before the Doctor returns to his TARDIS.
Sarah returns to her home with Toby, who is safe and sound. She apologizes to her stepmother for being rude, and promises to be a better sister to Toby. She also finds that her room is filled with souvenirs from the labyrinth, such as Lancelot (her teddy bear), Hoggle (a dwarf), Ludo (a gentle beast), Sir Didymus (a fox knight), Ambrosius (a sheepdog), and a blue worm. They are all her friends from the labyrinth, who have come to say goodbye. They tell her that they will always be there for her if she needs them. Sarah smiles and tells them that she will always need them.
The film ends with Sarah looking out of her window at the night sky. She sees a shooting star, which is actually the TARDIS flying away. She whispers "Goodbye" to the Doctor, before joining her friends in a celebration.