Passage: Ian Michael Nelson (born 10 April, 1995) is an American actor who portrayed a young Derek Hale in the television series Teen Wolf and Eric Palmer in the drama film The Judge.\n\nQuestion: Based on this passage, who played young derek hale in season 4?
Stream of thoughts:
Ian Michael Nelson
To answer the above question, the relevant sentence is: Ian Michael Nelson (born 10 April, 1995) is an American actor who portrayed a young Derek Hale in the television series Teen Wolf and Eric Palmer in the drama film The Judge.

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So, the answer is Ian Michael Nelson