Unfortunately, this entry is pretty patchy as I have some gaps in this latter part of the run and I apologise for that. If anyone has the missing copies to flog - at a reasonable price - please get in touch.
The beginning of 1982 saw the demise of SAVAGE ACTION, followed by RAMPAGE a year later. The former added the Night Raven text stories (which ultimately continued through to the demise of CAPTAIN BRITAIN monthly) whilst the latter added The New X-Men to the line-up.
Looking elsewhere on the 'net, the other shocker is the stonking price rise between issues 389 (45p) and 390 (60p) which is a rampant bit of inflation. It probably shouldn't come as a surprise that sales dropped over the next seven months.
MSH didn't merge with another title and 397 is officially the final issue of the run. However, as THE MIGHTY WORLD OF MARVEL volume 2 launched shortly thereafter I consider that part of the MWOM > MARVEL COMIC > MSH succession. Using that logic, the run that started in 1972 eventually runs out of steam in 1984 with the merger of MWOM's second volume with (of all things) SAVAGE SWORD OF CONAN.
SAVAGE ACTION merges.