Q: Can you use Mr. Fusion’s action in addition to your normal draw 1 /play 1 per turn?

A: To refresh, the Mr. Fusion card states “Once per turn, if you have this on the table, you may discard any other item you have on the table and draw 2 cards.”

In this case, it is a free action. (If it replaced your turn action, it would say so, as it does on the Pizza Hydrator promo card, which requires a turn action to be cashed in.)