First the molten man transformations from Spectacular Spider-man specifically episode 23 Subtext then in the episode right before it Gangland silvermane putting his armor on. Then in Earth's mightiest heroes pretty much all of the Skrull transformations the cynical side of me sometimes thinks Dragoniade skipped them unpurpose so he wouldn't have to add all of them. Finally in season 2 episode 23 all the sleeper robots combine into one transformers style