Last Friday we presented the "meta" tale of a comic book character reading a comic book...
When Seaboard Publishing/Atlas Comics reprinted this tale in Vicki #2 (1975), they did the usual modifications to keep the tale looking "current" that everybody else did with their older material.
I don't know if Atlas/Seaboard tried to get the rights to Tower's T.H.U.N.D.E.R. Agents, at that point only five years after their last appearance and still-fondly remembered by comics fans!
But, they ended up with Tippy Teen...who was renamed Vicki!
My personal opinion is that Seaboard's Martin Goodman discovered that Tower had abandoned the negatives/photostats at the printer (whom they didn't pay).
Like Israel Waldman who took similar abandoned material for his Super/IW Comics line, Goodman took the material (which also had never been copyrighted, so it was Public Domain as soon as it was published) and reprinted it, changing only the title to avoid a nuisance lawsuit from Tower (which was still publishing paperbacks) and claim a new copyright on the modified reprinted material.
My personal opinion is that Seaboard's Martin Goodman discovered that Tower had abandoned the negatives/photostats at the printer (whom they didn't pay).
Like Israel Waldman who took similar abandoned material for his Super/IW Comics line, Goodman took the material (which also had never been copyrighted, so it was Public Domain as soon as it was published) and reprinted it, changing only the title to avoid a nuisance lawsuit from Tower (which was still publishing paperbacks) and claim a new copyright on the modified reprinted material.