Fungus can fight. Using poisons and flesh-dissolving enzymes (think: mycological "meat" tenderizers), they can defend their turf from incursions by other fungi. Here, a sulfur tuft mushroom (top right) and Phanerochaete velutina (bottom left) hash it out.
The Last of Us is a new video game about the zombie apocalypse. But not just any zombie apocalypse. The Last of Us zombies are based heavily, and accurately, on a genus of parasitic fungus that really does take over the brains and bodies of non-human animals like tarantulas and ants. Kyle Hill has a lot of delightfully horrifying things to tell you about this fungus at the Overthinking It blog.
In comic books, radiation exposure always leads to awesome superpowers. In reality, not so much. Except in the case of Cladosporium cladosporioides, a fungus exposed to high doses of radiation during the Chernobyl nuclear meltdown. Not only did C. cladosporioides survive it gained a superpower — the ability to "eat" radiation.