Watford had no answer to the new Premier League leaders - as Pep Guardiola's side romped to a 6-0 win at Vicarage Road.
City followed up the 5-0 victory against Liverpool and 4-0 Champions League triumph against Feyenoord with another scintillating display.
It was an emphatic statement of intent after Guardiola claimed his side had to prove they could bridge the gap to Europe’s elite.
He had declared Watford a major test - but this was never even a contest, such was City’s attacking power.
Aguero opened the scoring with his head after 27 minutes, and struck his second four minutes later.
Gabriel Jesus made it 3-0 in the 37th minute.
Nicolas Otamendi struck City’s fourth in the 63rd minute before Aguero completed his hat-trick nine minutes from time.
There was still no letting up from the visitors, with Raheem Sterling winning and converting a penalty in the 89th minute.
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