Topps will include an extremely rare exclusive Munchkin card in its Mars Attacks:  Invasion set, due out this Friday (see "'Mars Attacks: Invasion'").  The card, "Asplode Their Heads" will be inserted into packs at a ratio of roughly one per case. 

Steve Jackson Games will release Munchkin Apocalypse: Mars Attacks, a 15-card expansion (see "'Munchkin Apocalypse: Mars Attacks'"). 

Topps’ Mars Attacks:  Invasion set will include a variety of other chase cards, including autograph cards from Pam Grier and other stars of the 1996 Tim Burton film, comic artists John McCrea, Charlie Adlard, Simon Bisley, and John Layman, and series co-creator Len Brown.   Sketch cards are inserted at a one per box ratio, and a limited number of the original Mars Attacks cards have been inserted.