Respawnpoint has had a series of marathons starting with the Sonic marathons which first started December 2010. These marathons are a reccuring thing in Respawnpoints streams. Ussualy every few months or so they happen and are events everyone can participate in.
This marathon happens every year in December. This marathon (As the name would imply) is a marathon of Sonic games. From classic to modern they play them all,even the ones that arent directly about Sonic (Sonic & Sega All Star Racing, Tails Skypatrol, Knuckles Chaotix, etc...) .