From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
Mighty Mask was one of the finalists in the 25th Tenkaichi Tournament. Apparently, Mighty Mask had not fared well in the previous Tenkaichi Tournament. He never actually got to fight in the finals because he was knocked out by Trunks Brief before the match. Trunks and Son Goten then took his costume and fought in the tournament as Mighty Mask until Artificial Human No. 18 used the Kienzan to cut the costume in half and exposed their ruse.
- Mighty Mask is able to become a Super Saiyan, albeit when it is actually Goten and Trunks posing as him.