At the 2007 WonderCon, the creators revealed that since 2005 they had been trying to produce a "Groo"/"Conan" crossover (both titles are published by Dark Horse). The project encountered a number of postponements; although two issues had been completed by the spring of 2011, the series was further delayed because of a backache suffered by Aragonés. The book finally saw print in July 2014, with Aragonés and writer Mark Evanier working with artist Thomas Yeates, who drew the Conan portions of the book.