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The Colossal Titan is seen to be far larger than any other Titan seen before by humans. It is stated to be roughly 120m tall, easily being able to peer over the top of the Walls.
The Colossal Titan emits levels of heat much higher than normal Titans; the temperatures are so intense that its skin and muscles bubble with the heat, comparable to that of magma and molten earth.
In the year 858, roughly 100 years after the creation of the Walls, the Colossal Titan appears at the Wall near Monzen. It kicks a hole in the Wall, allowing smaller Titans to enter through the breach and devour the humans living there. Before the military can react, the Titan releases a massive burst of steam and disappears.
The Colossal Titan is not seen again until two years later. Shortly after Eren and Shikishima fight each other (as the Mysterious Titan and White Titan, respectively), the head of the Military Police Regiment Kubal arrives and demands that Eren be handed over to him. After getting shot several times, it is revealed that he is the Colossal Titan and transforms.
As the Scout Regiment turn their attention towards it, the Colossal Titan kills several soldiers, including Jean. Eren is able to reach its nape, but is caught by the Titan before he can slice out Kubal. The Colossal Titan lets out an evil laugh and moves to crush Eren; however, the White Titan returns, carrying the last remaining bomb. It jams the bomb into the mouth of the Colossal Titan and activates it, killing Kubal and destroying the Colossal Titan.