Matter-Eater Lad (Tenzil Kem) is a superhero appearing in media published by DC Comics, primarily as a member of the Legion of Super-Heroes in the 30th and 31st centuries. He first appeared in Adventure Comics #303 (December 1962), and possesses the power to eat matter in all forms, as do all natives of his home planet, Bismoll.

Matter-Eater Lad has made limited appearances in media outside comics, with Alexander Polinsky voicing him in the animated series Legion of Super Heroes.

Matter-Eater Lad first appeared in Adventure Comics #303 and was created by Jerry Siegel and John Forte.

Matter-Eater Lad is the fifteenth member inducted into the Legion of Super-Heroes, joining soon after Bouncing Boy. In his first appearance, Matter-Eater Lad explains his origins, saying that the natives of Bismoll evolved their abilities to survive after microbes rendered all normal food inedible. This gives his teeth and jaws the strength and durability to bite and chew through stone, metal, and other hard substances. He has an unrequited crush on Shrinking Violet, which features for the bulk of the Legion's run in Adventure Comics.

Matter-Eater Lad is later drafted to serve in the Bismollian senate and becomes a celebrity. He is voted out of office after being temporarily trapped in another dimension and considered legally dead.

During the "Five Year Gap" following the Magic Wars, Earth falls under the control of the Dominators and withdraws from the United Planets. Soon afterward, the members of the Dominators' "Batch SW6" - temporal duplicates of the Legionnaires - escape captivity, with a duplicate of Matter-Eater Lad among them.

Following Zero Hour: Crisis in Time!, which reboots the Legion's continuity, Tenzil Kem is reimagined as the Legion's primary chef.

In the "Threeboot", Matter-Eater Lad is reintroduced as a government agent, investigating Cosmic Boy's disappearance and the legality of his final act as Legion leader.