When the player activates it through the taunts menu, an aggressive, toothy alien similar to a bread monster violently bursts out of the mercenary's chest and has some interaction with them before stuffing itself back in. Some classes add slight variations, like the Medic examining the alien or the Soldier attempting to grab it. The voice of the alien is the same voice of the bread monster's "screaming".
The Burstchester was contributed to the Steam Workshop.
- The Burstchester was added to the game.
- According to the Invasion Community Update Page and the original Workshop submission, the alien's name is "Chester".
- This taunt is a reference to the Alien franchise. After Chestbursters (a life stage of the xenomorph alien) develop inside a host, they burst out of the host's chest.