A masked hero resembling Champ appears in episode 34 of Uchu Sentai Kyuranger, The Mysterious Masked Man Arrives.
Space.34: The Mysterious Masked Man Arrives
Directed by Noboru Takemoto
Written by Nobuhiro Mori
After putting Shou into cold sleep, Champ headed out to find his creator Dr. Anton. What happened to him afterwards? Champ and Kukulger appear before the concerned Stinger and his team, and begin to attack the Kyurangers. However, a masked warrior appears calling himself “Buffalo Soldier”, who looks just like Champ, and they see the true nature of this second Champ when he rescues them. Just who is this Buffalo Soldier?