Power Rangers
Yost starred in more than two hundred episodes of the show's first four seasons. He was the only Ranger to appear in every single episode of the original series, Mighty Morphin Power Rangers, playing the part of Billy the Blue Ranger. With powers and motifs based on creatures such as the Triceratops and Wolf, the Mighty Morphin Blue Ranger is still one of the most popular in the franchise thanks to Yost's commitment to the role; Billy never switched colors or passed on his power coins to successors like the rest of the original cast. Yost's most high-profile work was his appearance in Mighty Morphin Power Rangers: The Movie, which took in over thirty million dollars at the box office in 1995. The movie was in theaters between the second and third seasons of M.M.P.R. and served as a non-canonical alternate opening for the third season.
After Mighty Morphin Power Rangers ended and Power Rangers: Zeo began in the fourth season, Yost stayed as Billy, but Billy's role within the show changed. Instead of his previous role as a Power Ranger, he became a technical advisor to the others. When asked about the change in a 2010 interview, Yost was evasive about how he'd personally felt about this but said he understood why the production team did it; He stated Haim Saban was interested in Super Sentai''s cast turnover and believes this was part of it. Yost eventually left the show toward the end of the Power Rangers: Zeo season. His character's final episode, "Rangers of Two Worlds", employed footage from previous episodes as well as vocal work from a separate, uncredited actor, to conceal the fact that Yost was not present during the taping. A tribute to the Blue Ranger and Billy was seen in the closing credits of this last Billy episode.
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