Slug (Ulysses X. Lugman) is a supervillain appearing in American comic books published by Marvel Comics.

Shea Couleé portrayed the character in the Marvel Cinematic Universe Disney+ series Ironheart (2025).

The supervillain Slug first appeared in Captain America #325 (January 1987) and was co-created by Mark Gruenwald and Paul Neary.

In regards to the character's concept, Mark Gruenwald once commented that he initially thought a 1,200 pound man was implausible, but later discovered the existence of such individuals through reading People magazine.

Ulysses Lugman was born in Miami, Florida. He is a notorious drug kingpin and criminal organizer, as well as the president and owner of several legal businesses in Miami. Due to his obesity, he took on the name "Slug."

After discovering that Slug is involved with the Kingpin, Nomad infiltrates his organization. Slug battles Nomad and Captain America, but he is ultimately defeated and his criminal empire is dismantled.

Slug is one of the villains shown in the crossover event Dead Man's Hand, where he meets with other criminals to divide the territory and possessions of the deposed Kingpin. The situation falls apart due to various factors, including infighting among the group leaders and the infiltration of Microchip and Mickey Fondozzi. Slug attempts to escape, but is caught by Nomad.

Slug breaks out of the Raft and joins the Hood's criminal empire. He helps them fight the New Avengers, but is taken down by Doctor Strange.