The stress of this causes him to transform in reality and the Hulk subsequently breaks free of the prison.

Still, he has to take extra precautions because he occasionally has attacks, which could cause him to transform in public.

From that point on, anything Mayu drinks (with the exception of water, although it did turn her invisible one time) will cause her to transform.

Calvin once zapped himself and Hobbes with this invention multiple times, causing them to transform into many different things.

A train slams into him, causing him to transform back to a human.

It becomes noticeable that events cause Wren to transform into a different animal in each of the three books.

She was once cursed as a child, which causes her to transform into a mouse any time she uses magic.

Unbeknownst to her, the potion causes her to steadily transform into an enormous dragon.

Both governments raid their meeting place, causing Mironenko to transform fully.

"What caused you to transform this time?"