Breakthrough is the thirty-third mission of Metal Slug: 2nd Mission.
After the destruction of the Slug Sub in the harbors, Gimlet and Red Eye row their emergency boats across a stream near the city. There are floating mines to jump over, and missile salvos and Rebels are above water to row away at. The player must keep a constant and quick speed in order to jump over the large gaps in-between the waters; hitting the sides sinks Gimlet and Red Eye to their death.
|Slug Sub ruined. Evacuated with emergency escape. Request location confirmation and next orders.|
|Site confirmed. Move to the checkpoint with pod after evac. You won’t go fast by tapping the buttons blindly. Use the right timing to propel the boat quickly.|
|Slug Sub’s hit! I’m sinking! I gotta eject! The island’s so close! Rats! I’ll be swept away.|
|Red Eye? At last I got through! And you’ve just ejected. Pathetic!|
|I’m sorry, but I must eject. Tell me my orders later. In this current, I’ll really drift off course.|
|The Slug Sub you took… was going the wrong way anyhow. You’ll drift right to the rebel base. Talk about luck!|
Completing this mission proceeds to Mission 30 (Crossed Paths).