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That link is a certain Lino Facioli.
The British-Brazilian actor previously portrayed t**-suckling tearaway Robin Arryn in GoT.
Now much older, Facioli is on our screens again, this time as Moordale High student Dex Thompson - a brainy teen who competes in the school quiz team alongside Maeve Wiley and will surely reappear in season four.
He's also whipped his kit off in the latest season, and a lot of viewers are finding it difficult to process that it's the same person who played little Robin:
Another casting reality that Sex Ed fans are struggling to get to grips with is the fact that the actors who play Mr Groff and son Adam aren't actually related.
Alistair Petrie plays dethroned Moordale High head Mr Groff, while Connor Swindells plays his on-screen son Adam.
Clearly, they aren't related, but their likeness is such - in terms of appearance and mannerisms - that some people think it could be the best father-son casting ever:
Petrie confirmed to LADbible that Swindells definitely isn't his real son, though he admitted he is like an 'extra son' to him.
Told that 'Is Mr Groff Adam's real dad' is one of the show's most popular search terms, Petrie said: "Ha, really? That was funny. I can confirm that he's not my real son, although I do love him dearly.
"He's like an extra son to me. I have two boys but I really do consider Connor my third son.
"He's such an incredible talent. They cast him before they cast me, and I remember when we got together and read for the first time, everyone in the room was like, 'ah, ok, I think we've got something here'."
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