Ben 10

S02:É02 - S02:E02 - Big Tick

A giant alien tick that "sucks planets dry" lands in Yellowstone National Park with the sole purpose of spreading its toxins and destroying the earth. Accompanied by three alien devotees, the tick seems unstoppable until Ben changes into a new alien entity, Cannonbolt, and destroys the tick from the inside out, saving the planet in the process.