In
Daredevil #25 (1965), writer
Stan Lee and artist
Gene Colan created and introduced a criminal named Vincent Patilio who creates electrical "leaping coils" and becomes the costumed villain
Leap-Frog. The villain appeared in a handful of stories and then made his final appearance as an active criminal in
Iron Man #126-127, published in 1979. Three years later, writer
J. M. DeMatteis decided to revive the idea of Leap-Frog but as a more comedic, light-hearted character, a would-be hero rather than a villain. Named "Frog-Man", this new character was introduced as Eugene's previously unknown son in
Marvel Team-Up #121 in June, 1982 (with a cover date of September). The series
Marvel Team-Up featured
Spider-Man joining forces with one or more Marvel characters in each issue, and issue #121 paired the web-slinger with his longtime friend and occasional rival
Johnny Storm, the
Fantastic Four member known as the Human Torch. Frog-Man's first story was illustrated by artist Kerry Gammill who designed Eugene's civilian appearance. Frog-Man appears again in
The New Defenders #131 (May, 1984), in a story plotted by his creator J. M. DeMatteis, scripted by
Peter B. Gillis, and with art by
Alan Kupperberg and Christie Scheele. In the story, Frog-Man remarks that he has only had two adventures and hopes to become a more impressive hero by joining the superhero group known as the New Defenders. Frog-Man then meets team members
Beast,
Angel, and
Iceman. The same issue introduced a new, comical would-be villain known as the
Walrus, a man who is given superhuman strength by "omicron rays" and then takes inspiration from his favorite
Beatles song, declaring he now has the "proportional strength of a walrus" (a joke by DeMatteis on how Spider-Man is often described as having "the proportional strength, speed, and agility of a spider").
The Amazing Spider-Man #266 (July, 1985) presented a story written by Peter David and with art by Sal Buscema and Joe Rubinstein. In the story, writer Peter David mistakenly refers to Eugene Patilio as Eugene Colorito. The story also shows Frog-Man meeting the would-be teenage hero Spider-Kid and the mutant Toad, a former member of the
Brotherhood of Evil Mutants. The issue ends with the three deciding to become a crime-fighting team called the "Misfits" (due to Spider-Man using this word to describe the trio). In 1993, the April issue of
Marvel Age #124 featured an
April Fool's Day ad for a new Misfits team with a membership of Frog-Man,
Squirrel Girl,
Razorback, and
3-D Man. Frog-Man appears next in
Marvel Fanfare #31-32 (1987), in a two-part story plotted by Frog-Man creators J. M. DeMatteis and Kerry Gammill, scripted by DeMatteis, with art provided by Gammill along with inker Dennis Janke and colorist Bob Sharen. The story features Frog-Man meeting
Captain America. Frog-Man then aids Captain America and the superheroes he previously met (Angel, Iceman, Beast, Human Torch, and Spider-Man) against the villain
Yellow Claw. The issue also features Spider-Man and Vincent Patilio developing a respect for each other, leading Spider-Man to later remark that Eugene's father remind him of his own Uncle Ben. Frog-Man does not appear again until 1991 in
The Spectacular Spider-Man #184, though he only appears on the last page as a lead-in for the subsequent story.
The Spectacular Spider-Man #185 presents a story written by J. M. DeMatteis, with art by Sal Buscema and Bob Sharen. The story explains Eugene's absence from comics since 1987 as a result of the young man now attending college and living on a campus outside of New York City. The issue also introduces Eugene's Aunt Marie, who lives with his father and acts as a surrogate mother, and further expands Eugene's childhood and that his mother died before he was a teenager. The story features the villains White Rabbit (who now sees Frog-Man as her arch-enemy) and the Walrus, who join forces as "the Terrible Two." At the end of the story, Vincent presents a new version of the frog-suit that now has a strength-enhancing exoskeleton and more accurate leaping controls. ==Fictional character biography==