The 29-year-old actor made a name for himself playing geeky teen Kenny in We’re the Millers alongside Jason Sudeikis, Jennifer Aniston and Emma Roberts back in 2013.
He went on to star in The Maze Runner, War Machine and Black Mirror: Bandersnatch, but it’s his upcoming role in Guardians of the Galaxy Vol. 3 - and his impressive transformation that has got fans talking.
Sharing a clip of Poulter in character as Kenny, before cutting to a more recent shot of him in Why Didn’t They Ask Evans? and a shot from San Diego Comic Con, TikTok user @jasminedarya wrote: “My brain is literally not comprehending this man’s transformation.”
And it seems other film fans agree, with one fellow TikTok user writing: “Is that the same person?”
Another said: “When actors get roles for marvel there's no other choice but to GLOW UP.”
While a third commented: “He now looks like his own older brother.”
Someone else joked: “Kevin Fiege said here have Adam Warlock and he took that personally.”
Poulter has previously said he wouldn’t ‘recommend anyone’ puts themselves through what he did to get in shape for him role in the upcoming Guardians of the Galaxy Vol. 3.
Marvel describes the character as being 'genetically engineered by scientists to be the perfect being' - so naturally that’s a pretty big ask of any actor.
In an interview with The Independent, he said: “The most important thing is that your mental and physical health has to be number one, and the aesthetic goals have to be secondary, otherwise you end up promoting something that is unhealthy and unrealistic if you don’t have the financial backing of a studio paying for your meals and training.
"I’m in a very privileged position in that respect, and I wouldn’t recommend anyone do what I did to get ready for that job."
Poulter went on to reveal that he was now in the 'maintenance phase' of the transformation process; explaining that he was 'not eating copious amounts of food to bulk', but he was also 'not cutting' and revealed that he'd not touched alcohol since the New Year, adding that the 'whole social side' of his life 'has to take a back seat'.
Featured Image Credit: San Diego Comic Con/New Line Cinema