So is this line dead, or what?

There were four waves in 2021, three waves and the Sentinel in 2022, only one wave and Ghost Rider in 2023. Since that there has been nothing new teased/revealed/announced/put up for pre-order that I've seen.

If they have ended the line I may need to pick up that 5 POA Doc Ock from the other Spider-Man line to go with these.

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Apparently, according to Hasbro, it’s “on hiatus”.