One of the best video game series to speedrun is Mega Man, a set of platformers about a blue robot who must fight against the evil entity who created him, Capcom.
The Mega Man games are full of interesting (but not totally gamebreaking) glitches and jumps that require pixel-perfect timing to execute correctly, which makes them extremely entertaining to watch. So it's no surprise that the Mega Man 4 speedrun race was one of the best runs in this week's Summer Games Done Quick marathon. (MM4 is also my personal favourite Mega Man, as I have many fond memories of getting to Dr. Cossack's castle as a child and then never getting past the first stage.)
You can watch it all above. Cut to the 40-minute mark for some crazy ending theatrics, and jump ahead to 48:30 if you want to watch Mega Man 10 instead.
(Special thanks to Kotaku reader popeadope for bringing this rad race to my attention. If you spot any other awesome SGDQ runs you think we should highlight, hit me up.)