Billy, the original Blue Ranger, returned in Power Rangers: Once & Always, bringing back classic equipment from Mighty Morphin Power Rangers.

Source: https://screenrant.com/power-rangers-once-always-flying-car-mighty-morphin/

Fortunately, the original Blue Ranger Billy, arguably the smartest character in the universe, was there to assist this new team of Rangers.

Source: https://screenrant.com/power-rangers-cosmic-fury-red-ranger-amelia-jones/

The Blue Ranger, Billy Cranston (David Yost), wished for a world that's free of prejudice.

Source: https://www.cbr.com/things-power-rangers-aged-poorly/

The original Blue Ranger presented his friends with an easy solution, the Radbug.

Source: https://screenrant.com/power-rangers-once-always-flying-car-mighty-morphin/

Yost (the original Blue Ranger, Billy Cranston) and Jones (original Black Ranger, Zack Taylor) are the only members of the Mighty Morphin Power Rangers' original lineup expected to return.

Source: https://www.cbr.com/mighty-morphin-power-rangers-reunion-images/