Iron Man 3 marked the last time Tony embarked on a standalone journey on screen, and while that movie wasn’t nearly as important as other past MCU entries in the now-released Avengers: Endgame, the Phase 3 capper did reference Iron Man’s last solo outing through one of the characters it introduced: Harley Keener.
Tony Stark has been one of the most important characters in the go since it launched, but let’s not forget that it’s been six years since his solo film series wrapped up.