I can't remember who posted about this a few months back but it is HERE and I love it. 
A corner of the game board showing infant island and Mothra. With secret passage to Seatopia.
Three game cards with illustrated art. Gigan (kaiju suspect), Planet C (location), Seatopians (nefarious mastermind)
Back of the box game description:
Clue
GODZILLA
In CLUE®: Godzilla, Minilla is missing, and treacherous forces are behind the abduction.
If Minilla is not found and rescued soon, Godzilla will wreak havoc on a global scale.
It's up to you to solve the mystery: WHO is the Kaiju holding Minilla hostage - could it be Rodan or Gigan? WHAT group orchestrated the kidnapping - perhaps the Xiliens or the Kilaaks? And WHERE is Minilla being held - are they on Monster Island, in Seatopia, or somewhere else entirely? The clock is ticking, act fast and solve the mystery before the "King of the Monsters" turns matters into global destruction!
Godzilla Clue board game box. 60s era Godzilla on the cover, plus many of his foes.