Also known as "Return of the X Factor."
As per the series' constant change in animation, Mister X's cyborg form was slightly redesigned to be much softer than season one's more angular designs.
This episode features flashback footage from The Dashing Entrance of Lupin III and like previous appearances, it was written by Tadaaki Yamazaki. Mr. X did reappear in Is Lupin Still Burning? but in his Part 1 look.
On Italian TV airings, this episode was aired as the final episode of the series instead of Farewell My Beloved Lupin due to both the other Lupin plotline as well as a link between the first episode of Parts 1 and 2.