The Dreadnought is a boss from Tyrian. It is fought in the Dread-Not level during the fourth episode.
The Dreadnought is Javi Onukala's personal battleship, which he uses to attack Savara and Trent Hawkins. Despite not being particularly large, the Ninja claims that it's energy readings are about the same as a planet. In order to destroy it, Dougan feeds Trent's ship with data on the Dreadnought's weaknesses.
The Dreadnought is a tough boss, as it has various targets that must be destroyed: two three-way cannons on the mid-section, two laser guns on the upper portion, four cannons on the back, the frontal portion and the ship's main body.