Team Fortress 3

The engineer was the fourth mann brother all along ! :O

Engineer attempt to frighten the three Manns by claiming he's their fourth long lost brother.

Red Scout and the Horseless Headless Horsemann are surprised that Engineer is Blu Scout's brother.

BLU Engie and BLU Scout fistbump. This surprises RED Scout and the Horseless Headless Horseman for some reason.

Red Scout and Superman stare at Blue Scout and Engineer bro fistin it up in here. Its getting funky, you can tell by the look in their eyes.

A soldier with bushy eyebrows and a medic stare at two BLUS- a scout and engie giving eachother brofists.

Bros 4 lyfe

I think it's a symbolic representation of the MedicxHeavy ship, but Heavy's symbol is somewhat... deformed.