By PRC Studios standards, Mr. Celebrity is decidedly an "all-star" picture. The title character is a prize race horse, jointly owned by veterinarian Jim Kane (James Seay) and his orphaned nephew Danny Mason (Buzzy Henry). When not tending to ailing nags, Kane struggles to prevent Danny's snobbish grandparents (William Halligan and Laura Treadwell) from gaining custody of a boy. Naturally, Kane will be able to afford to officially adopt Danny himself, if only Mr. Celebrity wins that all-important Big Race. The film's highlight is the custody-hearing sequence, in which several human celebrities of yesteryear show up as witnesses: Silent film stars Clara Kimball Young and Francis X. Bushman, both of whom reminisce about their career highlights, and former boxing champion Jim Jeffries, who recalls his glory days of the 1890s. Incidentally, leading lady Doris Day is not the 1950s box-office champ of the same name.