Super Mario Bros.: The Lost Levels
In Super Mario Bros.: The Lost Levels, Bowser (blue) was part of the Koopa Troop during the invasion of the Mushroom Kingdom and the kidnapping of Princess Peach that took her to a parallel world. He was stationed on 8-4, but failed when Mario & Luigi managed to get past him.
In the kidnapping of Peach thereafter, Bowser (blue) was placed in 9-3, but once again couldn't stop the Mario Bros. from advancing. A Fake Bowser (blue) version of him, revealed to be a Spiny in disguise, was also placed on D-4. Nevertheless, Mario & Luigi got through him.
Bowser (blue) can breathe fire. He can also throw a number of hammers.