The notoriously confident Dane had spent the previous two seasons on loan - first at Sunderland, and in Turin last season with Juventus.
Both parties were openly trying to negotiate a deal for the striker to leave, and it appeared he was certain to do so.
However, come deadline day - and a failed attempt to loan Chelsea striker Demba Ba - it became apparent that the forward would remain at Arsenal.
It is rumoured that he was close to a move to Crystal Palace, but when Chelsea cancelled the Ba deal, Arsenal were left with no alternative but to keep the former FC Copenhagen frontman.
It's not often players receive a second chance with their career, but this is exactly what Bendtner has.
Still only 25-years-old, the Denmark international has plenty of time left in his career.
Though frustrating, some of the big striker's goals prove his underlying ability.
After returning to the club overweight, he has trimmed down significantly - even if the trim didn't extend to his bushy beard and long locks.
In his few appearances this season - mostly coming from the bench - he has looked reasonably sharp.
Arsenal are currently flying, with their plethora of midfield talent guiding them to the top of the league.
However, the Gunners are vitally short up front, with star-man Olivier Giroud the only recognised striker alongside Bendtner.
And with a gruelling 13 days approaching, Bendtner has a monumental chance to prove his worth to Arsene Wenger's side.
Should the Dane play well when called upon - starting tonight - then his re-arrival at the Gunners could prove equally as fruitful as the free signing of Mathieu Flamini.