According to SpongeBob, the purpose of Roger is to teach the students the meaning of life. Roger's shell represents the fragile line between life and death when behind the wheel of a boat. The light bulb on top of Roger represents knowledge; without its energy, Roger would die, (and without knowledge a driver can die too).
Role in episode
He is the boating school's class science project. In order for Roger to live, he needs a working lightbulb hanging above to keep him warm, and is held in a egg holder within a glass box. There are speculations that Roger might not be a "good" thing, because after SpongeBob loses his Good Noodle Star he calls himself a "Bad Egg."
At the end of the episode, Roger's egg hatches into a chick. The chick then says "Hey, what'd I miss?"
Role in The Yellow Avenger
I can turn into a skyscraper!
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