From Halopedia, the Halo wiki
Playtime is a Halo: Reach Machinima series by Nevin "CruelLEGACEY" Douglas. It is set in Forge World and revolves around the adventures of two soldiers, Warren and Cobra. It has been featured on Halo Waypoint, and is notable for being made by only one person.
The series opens with Cobra calling up his friend Warren to get help with his training. Warren accepts, mentoring Cobra throughout the course of his training. Warren manages to teach Cobra the basics, which come in handy during season 2.
In Season 2, Cobra and Warren are faced with a new challenge. The Covenant have landed on the ring, and are planning to use a huge device known as "The Ascendant Tower" to wipe all life from the surface of the ringworld, thereby allowing them to take control. They are led by a ruthless Elite warrior known as the Commander. Warren and Cobra drive off the invading Elite, but in the process, Cobra goes missing. However, the season finale's post credit scene reveals Cobra is still alive, captured by the Elite Commander, who told him that he only "delayed the inevitable".