90s TV hunk looks unrecognizable with thick brunette hair and long beard – but can YOU guess who it is?

He was considered something of a heartthrob as a teen TV star back in the 90s.

And the 50-year-old actor, known for his bright blonde locks and cheeky boyish smile, now looks unrecognizable with his jet-black wavy locks and a long beard.

Now a star in movies like 12 Dates Of Christmas, Dead Man On Campus and Precious Cargo, the handsome guy has carved out quite a career for himself.

But can you guess who it is yet?

It’s Mark-Paul Gosselaar – known as Zack Morris in Saved By The Bell.

It’s Mark-Paul Gosselaar – known as Zack Morris in Saved By The Bell (pictured with Elizabeth Berkley as Jessica ‘Jessie’ Myrtle Spano)

The actor captured the hearts of the nation when his debut show aired in August 1989 as he became the cheeky bad boy that everyone adored.

Mark-Paul has now ditched his golden colored locks, which were inspired by Vanilla Ice’s frosty tips, and has now embraced his naturally thick dark brown hair.

NBC’s Saved By The Bell became a fan favorite when it first aired in the US in 1989.

After airing every Saturday morning, the sitcom soon became a channel flagship and had several spin-off shows during the 90s.

The show proved to be his biggest success as he is still pursuing a budding acting career after recently starring in Found, Will Trent and Missing While Indoctrinated.

Speaking to Jimmy Fallon in 2015, Mark shocked TV fans after admitting his hair wasn’t naturally blonde.

‘People think, ‘Oh, that’s your natural hair colour’ – it wasn’t. It was Clairol color,’ Paul said as Jimmy held up a photo of the actor sporting bleached locks.

‘It’s not natural, guys, you can see the brown going through,’ he added.

The actor captured the hearts of the nation when his debut show aired in August 1989, becoming the cheeky bad boy everyone adored

But as the ’90s star celebrated turning half a century old, the acting sensation looked nothing like his former self

Mark-Paul has ditched his golden colored locks, which were inspired by Vanilla Ice’s frosty tips, and has now embraced his naturally thick dark brown hair

NBC’s Saved By The Bell became a fan favorite when it first aired in the US in 1989. After airing every Saturday morning, the sitcom quickly became a channel flagship and had several spin-off shows throughout the 90s

Mark also revealed that after each season, the crew were sure they would be canceled, so everyone said their healthy goodbyes every year.

He said: ‘You know, our show, every year we thought we were going to be cancelled.

‘Every single season of Saved By The Bell it was ‘cancelled’. At the end of the season we all left, we said goodbye to each other.

‘And that’s why every season my hairstyle was so radically different! Because I was just going to school and I was into Vanilla Ice, because Vanilla Ice was big in 1990, so I had the shaved sides and like the big bouffant.’

The show proved to be his biggest success as he still pursues a budding acting career after recently starring in Found, Will Trent and Missing While Indoctrinated (pictured)