The Immortal Hulk (Saquatch, Hulk, and Muscle Growth Transformations)

Issue 4 of the most recent Hulk series features the Sasquatch, the college roommate of Bruce Banner, imitated the Hulk by bombarding himself with gamma rays. He gets stabbed in a fight and transforms on the operating table:

Issue 5 has two separate scenes of Saquatch reverting to humanity:

In issue 8, the disembodied body parts of the temporarily dead Hulk recombine for his resurrection (remember, in this series Hulk is immortal!). Unfortunately a scientist gets in the way and is absorbed in the process:

Later on there's a scene of the Hulk reverting:

Lastly, we see some Red Hulk action in issue 11. The Red Hulk is the green Hulk's resentful father-in-law: