Spawn #20 is a 1994 comic book written by Andrew Grossberg and Tom Orzechowski, with art by Greg Capullo, featuring a story where Spawn teams up with a time-traveling Harry Houdini to stop a madman with a bomb, concluding a two-part arc that explores Spawn's humanity and introduces the "Overlap" dimension. The issue is known for its crossover with the historical figure Houdini, who helps Spawn fight demons and navigate a supernatural world, and it was published by Image Comics.