Mark is on his way back home from a baseball game when an alien gargoyle called Bert summons him to save his home planet from evil monsters using his almighty baseball bat.
In this very strange game, you must defeat bosses in each stage before obtaining a key to the next stage. The player normally controls Mark, but by picking up a pill from monsters, Bert can be used. Bert can fly and shoot powerful shots, but he only lasts a short while unless another pill is obtained.
This is the fifth effort to tackle this game and the first to be published.