Megadeth is David's large grey tabby cat, who nearly kills Marco in osprey morph in David's room, until Rachel, in bald eagle morph, crashes through the window to rescue Marco. Before Marco knows Megadeth's name, he calls him "Mr. Kitty." When Marco mentions Megadeth's name and the name of David's pet cobra, Spawn, that prompts Cassie to remark that David has a bad taste in music but a good taste in comic books. When the Animorphs first meet David, they discuss the names of his pets as some of the few things they know about who he is.