So here's a real thing that is actually happening.
Team fighting is not a new concept in combat sports, as we can go back to the International Fight League (IFL) which helped produce some of today's Ultimate Fighting Championship (UFC) stars. But the difference between IFL and Team Fighting Championship (TFC), is that you didn't have the entire roster fighting at the same time.
Teams from all over the world entered the 40-foot ring back in January to compete at TFC 3 (full event description here), and below is a recently-released clip of Russia's "Barbarians" going head-to-head with Poland's "Hooligans From Arka (HFA).