'Trainspotting' returns this week after 21 long years with 'T2 Trainspotting'; a sequel loosely based on Irvine Welsh's follow-up book 'Porno'. With this long-anticipated new project, we see the return of director Danny Boyle, as well as all the main actors from the original movie led by Jonny Lee Miller.

Jonny Lee MillerJonny Lee Miller was glad to be back on the set of 'Trainspotting'

It's not always easy to get stars back for late sequels, let alone the whole cast, especially when there's a huge disparity between their age then and their age now. So what is it about 'Trainspotting' that attracted the likes of Ewan McGregor, Jonny Lee Miller and Ewen Bremner back to their 20-something-year-old personas?

'He's got a lot darker, he's got a lot sadder as a person', Jonny explained of his character 'Sickboy'. 'It's a lot of fun to play him. The whole shebang means a great deal to me.'

Watch the trailer for 'T2 Trainspotting' here:


Indeed, it seems such iconic roles as Sickboy, Renton and Spud have found their place in all the stars' hearts, not least the heart of director Danny Boyle who was nominated for a BAFTA for his work on the original 1996 film. 

For those involved to rally again behind such a cultural phenomenon is a very special thing. We'd seen it already with the likes of 'Star Wars: The Force Awakens' and 'Independence Day: Resurgence', but such things are rare for a small-scale Brit flick. 

More: Ewan McGregor worried he wasn't Scottish enough for 'T2'

So where do we find these junkie Scots 20 years later? Sickboy is no longer on crack and has taken over ownership of his local pub while growing cannabis and investing in the porn business on the side. Meanwhile, Renton's guilt and nostalgia takes him back to Edinburgh from the safety of his clean-living life overseas, while Spud is seeking help for his drug addiction.

'T2 Trainspotting' is set to hit cinemas on January 27th 2017.