From 1985 to 1987, Liefeld did pinups for Megaton Comics, including one of the character Ultragirl that would see print in "RAMM" #1 (May 1987) and "Megaton Comics Explosion" #1 (June 1987), a "who's who"-type reference book featuring individual entries of characters in the style of an encyclopedia or handbook. Carlson gave Liefeld an opportunity for his own creation, Youngblood, to see print in this form. The two-page entry featuring the team (consisting at that point of Sentinel, Sonic, Brahma, Riptide, Cougar, Psi-Fire, and Photon) was the team's first appearance in print.