Junior (released in 1994) is Arnold Schwarzenegger's second-ever comedy, which features him teamed up with Danny Devito, following their previous collaboration, Twins. Junior holds the dubious honor of being the second film ever to revolve around the world's first pregnant male.

Junior features Schwarzenegger as Alex Hesse, one member of a team of gynaecological scientists who have invented a new super-fertility drug, "Expectane", which will reduce the chances of a woman's body rejecting an embryo and thus causing a miscarriage.

When their research funding is withdrawn, and human experimentation is denied to them, they decide to pull a publicity stunt—performing an "embryonic transplant" (transplanting a uterus-equivalent, then fertilizing an egg taken from the ovum cryonics department, anonymously donated by another member of the team, Dr. Diane Reddin, and finally placing the fertilized ovum in Alex and dosing him with Expectane).

The experiment is only supposed to last for 3 months so Alex won't even get a bump, but Alex has a change of mind and actually goes through with the whole pregnancy, up to and including giving birth and keeping the baby. (In a kind of homage to the film's semi-predecessor, Rabbit Test, the baby is a girl.)

The main plot and the humour is based around Alex undergoing the physical changes of pregnancy, though there is a romantic side plot about Dr. Reddin first finding out they used her egg to get Alex pregnant, then falling in love with him. At the end of the movie, she is pregnant with their (technically second) child.