History of character is unknown.
- This version of the character is exclusive to the continuity of the film Gen13 and is an adaptation of Threshold. The original character was created by Jim Lee, Brandon Choi, and J. Scott Campbell and first appeared in Gen 13 #1.
- Threshold was voiced by Mark Hamill.
- 2 Appearances of Matthew Callahan (Gen 13 Movie)
- 1 Images featuring Matthew Callahan (Gen 13 Movie)
- Quotations by or about Matthew Callahan (Gen 13 Movie)
- Character Gallery: Matthew Callahan (Gen 13 Movie)
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