2003 Burger King Halloween kids meal premiums were Hamtaro Little Hamsters, Big Adventures toys. There were 8 toys in all.
Each character wore a plastic Halloween disguise. Penelope Ghost-Ham, Cappy Pumpkin-Ham, Boss Alien-Ham, Oxnard Spider-Ham, Bijou Witch-Ham, Hamtaro Franken-Ham, Elder Wolf-Ham, and Panda Skeleton-Ham.
Hamtaro ran in the United States from 2000 through 2006.
View the entire Burger King Halloween Hamtaro activity book here, courtesy of archive.org user KoCoProps.