Traditionally, the verb cast is uninflected in the past tense and as a past participle, and casted is not dictionary-recognized word. But in modern usage, casted is gaining ground and should be accepted as a real word, especially in film- and theater-related contexts.
Examples
In this example, cast is correctly used as a past-tense verb:
I cast my line, and sure enough he was all over it. [Colorado Angler]
And in this sentence, cast is correctly used as a past participle:
Ranulph Mabier, cast ashore by one of the Channel’s fierce storms, comes to live with the du Frocqs . . . [Shelf Love]
When the verb cast means to assemble a lineup of actors, the past-tense and past-participle casted is becoming standard—for example:
Jessica Biel, left, and Jaime Foxx, centre front, star in Garry Marshall’s impressively casted romantic comedy Valentine’s Day. [Metro News]
Even though this usage is becoming more common, cast still works in these contexts.
