The phrase "accidentally transformed" is correct and usable in written English.
It can be used when describing a situation where something was changed or altered unintentionally.
Example: "The scientist accidentally transformed the chemical compound during the experiment, leading to unexpected results."
Alternatives: "unintentionally changed" or "inadvertently altered".
All Prince Cinders wants to be is big and hairy like his brothers, and this leads to him being accidentally transformed into a gorilla by a rather inept, grubby fairy (who is, unlike her Disney counterparts, not at all feminine).
Through a movie studio client, Cinerama, I almost accidentally transformed myself into a movie producer, and that sustained me happily for several decades.
Attempting to escape her empty marriage and the drudgery of life on a rundown Appalachian farm, Dellarobia Turnbow heads for an assignation that accidentally transforms her life.
"Leap Dave Williams" had a lot in common with "The Santa Clause" in that Carrey's character accidentally began to transform into the Leap Day phenomenon.
One day while he was working, cold chlorine was accidentally exposed to extreme heat, which instantly transformed the liquid to gas.
When the vial of water is spilled accidentally, the rose withers, and the experimenters gradually are transformed to their previous aged appearances.
These lines were probably established accidentally and became stabilized in the offspring of the primary transformed cells early after the integration event.
The first stories appeared in ancient Assyria, in which the goddess Atargatis transformed herself into a mermaid out of shame for accidentally killing her human lover.
The boy whose life was transformed by watching Walt Disney's Fantasia at the age of six clearly wishes that others should be accidentally exposed to the musical tradition he loves.
Transformed people transform people.
This fungus is likely to transform our countryside more dramatically than Dutch elm disease, another fatal killer accidentally spread around the world by the timber trade, which has destroyed more than 25 million trees in Britain since the late 1960s.
