Alex confronting Michael when he thinks that he's cheating on Maria, even though Michael could beat the crap out of him even without his powers. When it turns out that Courtney is at his apartment, he punches Michael.
The ending to "Summer of '47" with Michael telling Captain Carver that he'd saved his life following the Roswell Incident and revealing his powers. Then they hug. Michael then goes to Liz and Maria and apologizes for what a jerk he's been and admits that he owes them for all they've done for him.