Marvel Two-In-One 1974
Like Marvel Team-Up with Spider-Man this featured the ever lovin' blue eyed Thing partnering up with other Marvel heroes and an assorted variety of other characters to fight evil or maybe locate a good poker game, I would assume these adventures occured during his Fantastic Four downtime. The series run ended in 1983.
The classic Marvel Two-In-One is available on Amazon.
Marvel Two-In-One