Stranger Things' lead actress Millie Bobbie Brown has been hailed as Hollywood's biggest new name and is in line to rake in more than $3 million a film at the tender age of 12.

And the boys of Netflix's breakout hit of the year also showed off their star power as they filmed scenes for season two of the nostalgic, sci-fi drama in Atlanta on Thursday.

Finn Wolfhard, Gaten Matarazzo and Caleb McLaughlin were spotted riding away on their trusty bikes as they undoubtedly attempted to get to the bottom of the spooky goings-on in the city of Hawkins.

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The boys are back! Finn Wolfhard, Gaten Matarazzo and Caleb McLaughlin were on set to film scenes for season two of Stranger Things in Atlanta on Thursday night

Season one of the show, which pays homage to 1980s genre films, was based around the disappearance of 12-year-old Will (Noah Schnapp) and the discovery of a psychokinetic girl Eleven (Millie Bobbie Brown).

And while the two weren't present on set, their co-stars were right in character as they braved the darkness to solve more mysteries in the small make-believe city in Indiana.

Finn, 13, who plays Mike Wheeler on the show and develops quite the crush on Eleven (Elle), was spotted peddling away on his bike with his pals.

Caleb, who takes on the role of Lucas, and Gaten, who plays Dustin, were later spotted filming together.

Discussing the Upside Down? Caleb, who takes on the role of Lucas, and Gaten, who plays Dustin, were later spotted filming together for the nostalgic, sci-fi drama

Having fun: Quite a different weekday night for the average teen, the boys couldn't resist flashing a smile in-between scenes for the eighties Indiana based series

Quite a different weekday night for the average teen, the boys kept the camaraderie alive as they flashed smiles in-between scenes.

The cult hit, which also stars nineties grunge favourite Winona Ryder, racked up 8.2 million viewers in the first 16 days since its release in July.

It draws influences from the work of the likes of George Lucas, John Carpenter and Steven Spielberg, with the latter hailing it as the best show of the year.

The boys were seen for the first time on the Stranger Things set in Atlanta last month, alongside fellow cast-members Natalia Dyer, Charlie Heaton and Joe Keery.

Filming begins: The boys were seen for the first time on the Stranger Things set in Atlanta last month alongside co-star Noah Schnapp (second from left) who mysteriously vanished in the first season

Powerful performance: Noah's disappearance was met by the arrival of a psychokinetic girl Eleven, played by Teen Vogue's Breakout Star Of The Year, Millie Bobbie Brown

'Back in production see you next year!' Last month, Stranger Things' directing duo Ross & Matt Duffer shared an upside down picture of the first table reading

While Millie was noticeably missing, the show's directing duo Ross & Matt Duffer confirmed her participation in the second series.

They shared an upside down black and white picture of the first table reading of the second season script and Millie was front and center on it.

However, it's unclear just how many episodes Eleven - who was based on E.T. - will be in after vanishing into ash with the monster in the finale.

'011 is back! It's official!' the British tween proudly announced to her 3M social media followers with a black and white snap with her co-stars.

'Can't wait to be back working with this lovely cast again for #strangerthings thank you to the amazing duffer brothers for having el back for a second season!'

'011 is back! It's official!' Sitting front and center was none other than Millie, confirming her return as traumatised Eleven (Elle)

Talented: Millie has been hailed as Hollywood's biggest new name and is in line to rake in £3m a film at the tender age of 12 thanks to her portrayal in Stranger Things

Millie, who was named as Teen Vogue's Breakout Star of 2016, was described by industry bible Variety as harbouring ‘the kind of presence some actors take a lifetime to acquire [and] is about to be cast in a lot of projects.’

And while she is set to command millions for her upcoming Hollywood projects, her parents nearly went bankrupt after they moved from the UK to LA to back her stardom.

Stranger Things returns to Netflix in 2017.