"Journey to the Center of Mason" is the eighty-third episode overall and the fourth episode of the fourth season in Wizards of Waverly Place.
After she finds out that she will lose her powers, Alex can no longer date Mason, so they decide to try being best friends instead. After watching a film at the theaters, Harper, Alex, and Mason go home. Alex's ex-boyfriend, Dean, comes and asks her to get back together with him. Mason gets jealous. When Dean brings a gift for Alex, Mason asks what her relationship is with Dean. Max tells him that Dean and Alex used to date, making him more jealous. He turns into a werewolf and eats Dean. Alex, Justin, and Max come up with a solution to make Justin's toy Captain Jim Bob submarine big and go into it. They then shrink it back to normal size and go inside Mason. While there, they see his thoughts, which are all of Alex. They get Dean out, and when Harper, Max, and Justin leave, Alex tells him that he was knocked out and the doctor's solution was for them to dress up as cows. He then gives her his offer once again: he wants to get back with her. She tells him no, and then gets back together with Mason, deciding to get back to the Wizard Competition.
- Proton, neutron, get gone – Shrinks something.
- Proton, neutron, back to one – Makes something back to normal size.
- Daniel Samonas as Dean, Frank Pacheco as Felix, and Shoshana Bush as Tyler
Special guest star
- Gregg Sulkin as Mason