From Space Mission Pack: Concrete Jungle

Please read the description of the addon before you buy it. It's horde mode only content. The weapon you get, the medic gun, is reasonably powerful but struggles a bit on the whole "medic" thing due to the slightly floaty nature of character movement and shooting plus the game not being very friendly to staying still for more than a few seconds at a time. It's not pay-to-win by any stretch, but... a weapon like this probably should've been in the base game. The included horde mode character definitely makes the earlier parts of the game a bit easier, but it doesn't offer anything spectacular when compared to later base-game characters. All in all, it's a solid add-on, but I remain unconvinced that it's worth nearly $5USD.

You cant use any of the dlc in story mode. Wish i did more research so i didnt waste money 🤦‍♂️