Dr. Henry Jonathan Pym is a character appearing in American comic books published by Marvel Comics. Created by penciller Jack Kirby, editor-plotter Stan Lee and writer Larry Lieber, Pym debuted in Tales to Astonish #27 (January 1962). He returned several issues later as the original iteration of Ant-Man, a superhero with the power to shrink to the size of an ant. He later assumed other superhero identities, including the size-changing Giant-Man and Goliath; the insect-themed Yellowjacket; and briefly, the Wasp. He is a founding member of the Avengers superhero team, and the creator of the robotic villain Ultron. He is also the ex-husband of Janet van Dyne, the first Wasp, and the father of Nadia van Dyne, his daughter by his first wife, Maria Pym. Since his earliest appearances in the Silver Age of Comic Books, Pym has been featured in various Marvel-endorsed products including animated films, video games, television series, and feature films. Michael Douglas plays Pym in the Marvel Cinematic Universe films Ant-Man (2015), Ant-Man and the Wasp (2018), Avengers: Endgame (2019), and Ant-Man and the Wasp: Quantumania (2023). Douglas also voiced alternate-timeline versions of Pym in the Disney+ animated series What If...? (2021–2023).