Bob was camping one day when he was captured by an alien who took him to his lab
The alien did a test on him and see what would happen. The substance in the shot mixed with his cells to turn them clear. This also turned every part of his body clear so he could not be seen.
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The shot turned bob invisible and gave him powers of stealth speed and strength Which he would quickly learn how do do if he wanted to escape.
So Bob got up from the experimenting table and kicked the crap of of the alien with a magnifying glass which had heated up from the sunlight coming through the window that was next to him on the ground by shooting a lazer at the alien
After the incident he learned how to control his powers. He controlled his invisibility by eating ice cream which cooled down his body where the invisibility effect would wear off then he would just have to think about being invisible if he wanted to turn invisible again. He controlled his super speed by running like he normally would but the shot also made him lighter so he can travel faster then he would just slow down.
He dressed as a ninja as his outfit and now he protects the city from all the evil.