If signing one of the world's sharpest hit-men wasn't exciting enough for the City faithful there was also the tantalising prospect of the 23-year-old linking up with his fellow countryman Carlos Tevez to form a potentially fearsome front-line. There was frustration then when the latter threw an infamous hissyfit in Munich and found himself golfing in exile for much of the season leaving Aguero to largely furrow a singular path to 23 Premier League goals.
Three weeks after the striking striker returned to the fold he banged home a hat-trick away to Norwich as the title race hotted up and City went on a six-goal rampage. Yet it was this goal that stood out; a two-hander executed with such ease the home side may as well have been training cones.
This incredible rollercoaster season had already given us all enough drama to spread across ten and now it came down to this: a freeze-frame of an Argentinean forward eight yards out with a nation hung in suspended animation. A title rested on this. The greatest, most unforgettable moment in English football rested on this and even after a thousand replays it still genuinely amazes how Aguero remains so sniper-calm with history residing in his right boot.
With Onuoha shrugged off and a narrow gap visible between Paddy Kenny and the near post the soon-to-be legend drilled it home with the same nonchalance that you or I put the kettle on. The clock ticked to 93 minutes and 21 seconds and the world lost its marbles.
City were a goal down with 12 minutes to go against an impressive Liverpool and even at this mid-season point hopes of successfully defending their title were fading fast. Enter Gareth Barry with an off-kilter throughball designed for Aguero but which clearly gave him too much to do.
For a full appreciation of the opportunism and resilience that led to this ad-libbed worldy concentrate not on the goal-scorer but on Martin Skrtel as the ball skidded off the greasy surface out wide.
Like any good defender he's aware of the striker's movement on his 'blind-side' but with a full yard's advantage in the foot-race he's happy to slow to a jog - all the better for keeping your feet and hoofing it clear. Spying Pepe Reina racing out at speed Skrtel again does the right thing by changing direction and dropping in to provide cover. Only here's the thing: he doesn't complete his run to the goal but instead hangs back anticipating a cross should the worst occur. He does this because nobody could ever score from that angle. That would be imposs...oh.
From Aguero's eight derby goals this is the one most fondly cherished by Manchester City supporters and surprisingly not because it was an individual late winner at Old Trafford that reduced United's entire back-line to flailing ineptitude. On digging the ball out on the half-stride to rifle home from close-range the City superstar must have assumed the following day's back pages would be his and his alone only to be upstaged by Phil Jones' last-ditch gurning masterpiece. The defender's shocked expression as the ball flew past him was last seen in 1980's sci-fi films before special effects improved and prompted so much hilarity it consequently got giffed to kingdom come.
To paraphrase the song belted out each and every fortnight at the Etihad: 'This is how it feels to be City, this is how it feels to be small, you sign Beaker from the Muppets, we sign Kun Aguero'.
Ten hat-tricks in a little over six seasons is testament to the striker's prolificacy and this was his best and most important by far. City's Champion's League aspirations were hanging by a thread with just two points accrued and two games remaining and given those opponents were the mighty Bayern at home and Roma away progress to the knock-outs looked little short of impossible.
The Great Escape part one took place on a chilly November evening at the Etihad and a precise penalty gave the Blues hope early on especially as it also led to the dismissal of Bayern centre-back Benatia. Even with a man disadvantage however Bayern controlled the game and stunned their host with two quick finishes before the break.
An 85th minute equaliser had east Manchester rocking and set the scene for a hero's hat-trick a minute into added-on time. The goal itself was typical Kun; from the predatory dispossession of the last man to the manner in which he shielded the ball while positioning himself to shoot. Who said men can't multitask?
Anyone who has been privileged enough to watch this record-breaking goal-machine at close quarters down the years will know that he has threatened to score a humdinger like this for several seasons. Yet again it was a hat-trick strike but on this occasion technique and artistry is eschewed for direct dribbling, a means so often employed and so often denied at the third or fourth time of asking by a desperate stray leg. None appeared this time. Inside the box no-one dared.
If the run is exhilarating the finish is exquisite, placed wider than any mortal striker would entrust, and revealing for the 178th time that Sergio Aguero knows exactly where the goal is.
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