To her fans, Captain Marvel is a legend.

And they can rest assured that after being cast as the female superhero, Brie Larson is taking her duties seriously.

Taking to Instagram on Sunday morning, the Oscar winner shared a snap that will make comic book addicts swoon.

'R&D department!' Brie Larson reads Captain Marvel in bed... while dressed as superhero

In it, she reads a Captain Marvel comic, while tucked up in bed. But the real excitement is partially tucked beneath the sheets - Brie wears the costume of the butt-kicking air force pilot.

'LARSON INDUSTRIES R&D DEPT,' she wrote, referring to research and development.

Disney and Marvel announced just last month at Comic-Con that Larson will star in Captain Marvel as Carol Danvers, who gets special powers after an alien encounter.

'Call me Captain Marvel,' the Oscar winner wrote on Instagram with a picture of herself wearing a Marvel Studios cap.

Latest role: Brie Larson was announced on Sunday as the new Captain Marvel in a planned blockbuster

Big news: Larson will star in Captain Marvel as the butt-kicking air force pilot Carol Danvers who gets special powers after an alien encounter

She later added: 'Thanks for the love! I'm so excited to be part of the team.'

Captain Marvel will be the first film in the Marvel Cinematic Universe to center on a female character.

The film is scheduled for release in March of 2019.

Guardians of the Galaxy writer Nicole Perlman and Inside Out's Meg LeFauve are co-writing the screenplay.

New role: Brie Larson walks on stage at the Kong: Skull Island panel on day 3 of Comic-Con International on Saturday, July 23, 2016, in San Diego

No director has been announced.

Larson won the Best Actress Academy Award this year for her performance in Room.