The Forgotten Four: Immortality (2014)

"The Forgotten Four: Immortality" acts as a bridge between "The Forgotten Four" and "The Forgotten Five". Although it is uneventful, it has a few important parts. One being that Billy has plastic surgery and has a changed appearance. The most crucial part of the plot is that it is found out that Ethan is immortal, in which Steve, Alfonso, and Billy respond by letting him join.