Lenny Yogman

Lenny Yogman (voiced by Josh Peck, who is best known for Josh Nicholas in Nickelodeon's Drake and Josh) is one of two fraternal twins that are rarely seen attending class. Instead they are in their laboratory located in the school's H.V.A.C. system. They wear red hats that resembles the 1980s band Devo's energy dome hats, yellow shirts, and black sneakers. Lenny is the taller twin who wants to defeat Robot Jones at competitions as well as build robots to defeat Robot Jones. Additionally, Lenny enjoys humiliating and embarrassing Robot Jones whenever possible.

Physical Appearance
Lenny is the taller twin. Similar to Denny, he wears a red hat that resembles the 1980s band Devo's energy dome hats, a yellow shirt, green pants, socks with red stripes, and black sneakers. Like Denny, he also has buck teeth.

Personality
Lenny is the meanest twin. He often tries to defeat Robot along with Denny, but often fails. Lenny tries to defeat Robot Jones at competitions, and humiliating him whenever possible. At times, Lenny would call Denny "a fool" due to his frustration and when a mission is failing.

Robot Jones
Lenny, along with his brother, despise Robot, and tried to steal his brain in multiple episodes for many purposes. Robot also hates them a lot, and usually tries to stop them.

In "Electric Boogaloo", Denny and Lenny tricked Robot into becoming their friend so they could easily steal his brain. After their plan succeeded. Robot became depressed and hopeless. However, Robot, with the help of Mitch and Cubey, defeated the Yogmans.

In "Cube Wars", Lenny managed to win the contest, thanks to Denny's idea of switching two stickers to create a cube that can never be solved. This is the only time Robot was defeated.

In "Sickness", Denny and Lenny infected Robot with a computer virus, and tried to insert a second disk, but failed.

In "The Yogmans Strike Back", Denny and Lenny, again, tried to steal Robot's brain with the help of Robot's hypnotized friends.

In their other non-major appearances, Denny and Lenny would make fun of Robot and insult him.

Socks, Mitch and Cubey
Lenny also hates Robot's friends, as they usually stop him and Denny from succeeding. In "The Yogmans Strike Back", Denny and Lenny hypnotized them into becoming the Yogstrocity. Lenny came up with the idea to hypnotize them.

Principal Madman
Denny and Lenny both hate Principal Madman (possibly due to him giving them detention). In "The Yogmans Strike Back", both of them daydream about brainwashing him.

Mr. Mitchell
Denny and Lenny hate Mr. Mitchell, because he helped Robot get rid of the virus.

Yogstrocity and Yogbot X
Denny and Lenny both used them to carry out their evil deeds, and to be their friends.

Appearances

 * Whatever Happened to Robot Jones? (pilot)

Season 1

 * Cube Wars
 * Sickness
 * Politics
 * Electric Boogaloo

Season 2

 * The Yogmans Strike Back
 * Safety Patrol (cameo)
 * Popularity
 * Rules of Dating (cameo)