New Delhi, June 4 -- Marvel Studios is going all in-and then some for what is the world's costliest movie being made at a budget of a jaw-dropping $1 billion, with at least a quarter of it spent on just its all-star cast.

The studio is making this monumental bet on the Marvel Cinematic Universe's (MCU) upcoming crossover event film, Avengers: Doomsday.

From returning heroes like Chris Hemsworth as Thor and Tom Hiddleston as Loki to surprise additions like Pedro Pascal as Reed Richards and Vanessa Kirby as Sue Storm, the film spares no expense in packing in star power.

In a surprising twist, Robert Downey Jr is all set for a return to the MCU, but not as Iron Man; he will be seen as the iconic villain Doctor Doom.

While a massive chunk...