Unknown Worlds of Science Fiction was a short-lived black and white comic magazine published by Marvel Comics parent company Magazine Management. It is one of several titles from the 1970s where the publisher used Marvel's talent to produce content outside of the publishing industry's self-censoring "Comics Code." Unknown Worlds ran for six issues, as well as an annual, in 1975.
This issue, no. 5, features cover art by Sebastia Boada under his pseudonym Puigodmenech. It includes an adaptation of a story by author Larry Niven.