(& i guess Sunrise being the production company behind the show helps.)
Here we have the start of episode 189 of Gintama.
Notice how he looks just like Kai Shiden from the original Mobile Suit Gundam TV Series? This character was also a freelance journalist (which Kai was in Mobile Suit Zeta Gundam), and was voiced by Toshi Furukawa, who also voiced Kai in the original series. Also to note, the man this character met up with to talk about the past war was voiced by the Narrator for the original Gundam series, Ichiro Nagai.
Well that’s not all. The story of the past began, and it didn’t take long for this scene to happen.
& we find out at the end that it was the staff that was behind it all. Pure genius Gintama, at it again.