The Vision is an android, but Scarlet Witch still somehow fell pregnant and gave birth to twins. However, it was later revealed that the unhinged mutant had created them using her magical abilities. A complicated plot was used to get rid of them, and that would lead to Avengers Disassembled and House of M. It was during the latter that Wanda brought them back, and they've since been reincarnated as Young Avengers members Wiccan and Speed.