If anyone had any doubts about Lewandowski's move to the Blaugrana - which they shouldn't have given his entire career - those are quickly fading now.
The Polish star was spectacular in his first Champions League game since making the move from Bayern Munich, scoring a hat-trick to lead Barcelona past Viktoria Plzen.
He was joined on the scoresheet by another new signing, Franck Kessie, as well as Ferran Torres, who came off the bench to provide a goal and an assist.
Yes, it was Viktoria Plzen, certainly no match for Barcelona, but what a performance it was from the Catalan side, led by their star striker.
Xavi's team will be so difficult to stop when he's in this mood.