[7] In 1979, Slifer (with the financial assistance of David Anthony Kraft), under the publishing imprint Excalibur Enterprises, published Collector's Classics #1: Manhunter: The Complete Saga, which reprinted the Archie Goodwin/Walt Simonson run of Manhunter backup stories from DC Comics' Detective Comics #437–443.

[9] He continued writing sporadically, most notably on Omega Men, where he co-created the extraterrestrial alien mercenary anti-hero Lobo with artist Keith Giffen.

[10] Slifer served as an editor at DC from 1984–1985 and oversaw the Green Lantern/Green Arrow reprint series, New Talent Showcase, and World's Finest Comics.

Slifer eventually became a supervising producer, story editor, and writer for the animated television program Jem and the Holograms.

[7] During his time at Sunbow, Slifer's colleagues included former Marvel Comics writers Steve Gerber and Marv Wolfman.

Early on June 23, 2012, Slifer was hit by a motorist while walking in Santa Monica, California, after spending the evening with friends.

Most critically, due to head injuries, doctors had to remove a portion of Slifer's skull[3] and place him in an induced coma[14] at the Ronald Reagan UCLA Medical Center.

[15] S.L.I.F.E.R., the Society for Legal, Investigative and Financial Empowerment and Recovery, was created in July 2012 to assist in bringing the hit-and-run driver to justice and providing updates on Slifer's condition.