While the ship's history before its appearance at the end of Star Trek IV: The Voyage Home has never been officially stated, several non-canon sources offered explanations following the release of the film. The AMT/Ertl Model kit documentation claimed it to be a renamed USS Yorktown (NCC-1717), while the Star Trek IV: The Voyage Home Sourcebook Update for the FASA roleplaying game identified it as the newly-built Atlantis (NCC-1786). The book Mr. Scott's Guide to the Enterprise, also published shortly after the film, identifies it as a different newly-built starship, the USS Ti-Ho (NCC-1798), which in the book had been a test bed for transwarp technology alongside the USS Excelsior. In Star Trek V: The Final Frontier, Captain Scott alludes to the ship being newly-built during its shakedown cruise, stating in his log "This new ship must have been built by monkeys".