"End of Days" received mixed reviews from critics. Brigid Cherry of Total Sci Fi rated the episode 5 out of 10, describing the episode's gaps and dangling plot threads as "downright annoying," and felt preceding episode "Captain Jack Harkness" was more intriguing.
Critics had mixed reactions to "End of Days." Brigid Cherry of Total Sci Fi rated it a 5 out of 10, pointing out its gaps and unresolved plot points as "annoying," and found that the preceding episode "Captain Jack Harkness" was more intriguing.