Fascinating photos show Judy Garland's doppelganger Dorothy stand-in on set during filming of The Wizard of Oz

Fascinating photos of the stand-in cast of iconic 1939 movie The Wizard of Oz have appeared online - including snaps of the actress who understudied Dorothy.

Judy Garland, whose Academy Juvenile Award-winning performance of Dorothy Gale stole the hearts of America, was given a stand-in actress.

Bobbie Koshay served as Garland's body and stunt double for the more action-oriented scenes in the classic film.

For example, Koshay is the one who fell into the pig pen in the beginning of the film, while Garland balanced on the wooden fence.

Koshay is the one who opened the doors to Oz, while Garland walks through the gates into Munchkinland, transitioning the movie from black-and-white into technicolor. Koshay was also lifted by the flying monkeys out of The Haunted Forest.

Pictured: Judy Garland's stand-in on set during filming of The Wizard of Oz

Pictured: Stafford Campbell and Bobbie Koshay stand-in for lighting and camera tests in The Haunted Forest

Pictured: Judy Garland Sitting with her stand-in Caren Marsh Doll and a munchkin on the set of The Wizard of Oz

Most notably, Koshay is the one who taps her heels together three times at the end of the movie, repeating the iconic phrase 'there's no place like home' as she and Toto are whisked back to Kansas.

Garland also had Caren Marsh-Doll as a stand-in, but she was used less frequently.

Stand-ins are commonplace in movie making. They're often used to help the camera department light the set and tweak blocking while the actor is absent.

The blurred effect from the vintage cameras used for filming made the facial details of the actors somewhat indistinguishable from certain angles, allowing the stand-ins to blend seamlessly into the film.

In addition to being her body double, Koshay was also Garland's personal trainer. She was assigned to put the 17-year-old child star through rigorous physical training for weight loss, including badminton, swimming, hiking and tennis.

Garland was forced to diet and was watched every time she ate by a staff member. 

She was even prescribed Dexedrine for weight loss, a drug new to the market in 1937 and typically given to treat narcolepsy, depression and obesity,

Garland was not the only actor with a body double in the film. 

Pictured: Judy Garland on set filming The Wizard of Oz with producer Mervyn LeRoy and director Victor Fleming, along with ToTo and the munchkins

Pictured: Director Victor Fleming tweaking the blocking of a munchkin on set

Margaret Hamilton, who played the Wicked Witch of the West double, had a body double named Betty Danko. Danko subbed for Hamilton during that character’s initial appearance in Munchkinland.

The body double for Bert Lahr, who played The Cowardly Lion, emerges from the back-forest, scaring Dorothy and company. 

A stunt double was also used when the Lion hurtles down the palace corridor in The Emerald City and leaps through a huge 'glass' window. 

While making his way through The Haunted Forest, The Tin Man, played by Jack Haley, is magically hoisted into the air. 

However, his body double was dropped with his back facing the camera.

Three stand-ins were used when the Scarecrow, Lion, and Tin Man climbed up a mountain to reach The Witch's Castle. During their ascent, the scene where the Lion utters, 'I hope my strength holds out,' and the Tin Man, gripping his tail, responds, 'I hope your tail holds out,' features the actual actors. 

However, scenes filmed before and after this two-shot dialogue exchange were all stand-in actors.

Pictured: Judy Garland as Dorothy Gale entering Munchkin land for the first time

Pictured: Dorothy, played by Judy Garland, discovering the Tin Man outside his cottage