Dennis is a villain who appeared in the Henry Danger episode Captain Jerk. He's a thief who's obsessed with weapons and collecting famous people's socks.
He was portrayed by Shayne Topp.
After an incident that caused the people of Swellview to see Captain Man as a criminal, he hosted a contest where winners would win a trip to the Man Cave. Piper got a group of kids to try typing in the code so she could take the credit for the code. Jasper wanted to be Piper's guest. Piper agreed- on one condition.
Jasper, Piper, and the other two winners arrive. Piper had made Jasper wear a female costume. Jasper and Piper realize that Kid Danger's voice and face was different and Henry claims that he went through puberty. One of the guests, named Mr. Yoshda, had bought his wife and doesn't really care about Captain Man. The other guest was Dennis and he had come alone. Mr. Yoshda and his wife begins to watch an episode of iCarly. Captain Man then lets everyone break a chair on him and he then shows them their weapons. He and Henry show Jasper, Piper, and Dennis a weapon disguised as a hot dog which they called the "Covert Wiener." They explain that it was used to look like a regular hot dog, but if a bad guy ever appeared, the hot dog could shoot the bad guy and kill him. Dennis then takes the Covert Wiener and grabs Jasper. He says that if anyone tried to stop him, he would kill Jasper and Dennis asks for the fastest way out. Henry and Captain Man say the fastest way out was the tube. If he went under it, the tube would go over him and he just had to yell "Up the tube!" and he would be out. Dennis does this, but then, Captain Man makes the tubes override. They double the power and they send Dennis back down painfully. They send him back up, then back down. They put the tube up and Dennis falls to the floor. They send the tube back down and it hits Dennis on the head. Henry grabs the Covert Wiener and Captain Man sends the tube up and down three times, hitting Dennis and he falls unconscious.