Calvin In Tiger Form(right)
Calvin In Tiger Form refers to two minor alter egos of Calvin's.
Transmogrified Calvin
This alter ego appeared in a single story arc (3/23 through 4/3 1987), where Calvin used his newly invented Transmogrifier to turn into a tiger. As a tiger, Calvin retained his human form's small stature.
Made-up Calvin
This alter ego also appeared in a single story arc (3/7 though 3/24 1988), where Calvin tried to assimilate the lifestyle of tigers. To do so, he changed his appearance somewhat with makeup and a costume.