Kate was the youngest sister in the Walker resicednse, having to older brothers, the middle one being John Walker, whom would become known as the U.S. Agent.
Kate Tollifson was created by Christopher Priest, George Jeanty and first appeared in a cameo in U.S.Agent #1 and fully the next issue in #2. However, Kate had an unnamed cameo years earlier in the pages of Captain America issue 333 (1987), so some credit is due to Mark Gruenwald and Tom Morgan, the writer and artist of that issue.
Major Story Arcs