Liam Neeson has a minor role in a great movie called The Mission back in 1985, which starred Jeremy Irons and Robert DeNiro.
I might be able to go further than that.
He had a role in the movie "Excalibur" with Patrick Stewart.
And a teenaged Christopher Walken (credited as "Ronald Walken").
Even as teen, he freaks you out
"You know kid...........it's very dangerous to cross the street"