Captain America: Castaway in Dimension Z (Captain America, #1-2)

Trapped in the strange distorted world of Dimension Z, Captain America finds himself the lone custodian of a young boy who just happens to be the son of the sinister scientist Arnim Zola. Travelling through a desert wasteland, Cap battles to keep his young ward safe from harm. But with the warped super villain's evil agents on his trail and the savage Barbarians of Phrox on the prowl, Cap faces one of the most gruelling challenges of his life.

Collects Captain America vol 7 #1-10.