BIONICLE #18: Seeds of Doom is the eighteenth issue of the BIONICLE comic series.
The inside front cover provides brief backstory. The centerfold contains information about the six types of Vahki. A back page teases the movie BIONICLE 2: Legends of Metru Nui, combing to DVD and video in Fall 2004. Another back page promotes BIONICLE's return to Comic-Con International in San Diego, July 22-25, 2004. It also announces that the results of the Rahi Building Challenge have been decided and promotes the new BIONICLE Metru Nui City Guide book from Scholastic, coming in the summer. Another back page promotes the Kanoka Club at www.bionicle.com. The back cover advertises an exclusive deal to buy two of the Vahki sets, Nuurakh and Bordakh, early.