Underdog - Season 3 - Eps 22: Round and Round, Pt 2
After returning from a strange planet and wearing a charm that the alien from the planet he brought back to Earth with him, Underdog is interviewed by Sweet Polly about the rescue and retrieval of the alien. However, once he stands up, he becomes dizzy as things begin to spin around. Back on the strange planet, Zorb explains that as long as Underdog wears the charm around his neck, he will become dizzy. He then checks on Cron, who is being examined by scientists. Cron is caged when he becomes agitated. He then takes a pill Zorb gave him which causes him to grow and break free.
About Underdog

Title: Underdog
First Air Date: 1964-10-03
Last Air Date: 2000-02-01
Status: Ended
Rating: 6.2/10 (from 22 votes)
Language: EN
Seasons: 4
Total Episodes: 125
Network: NBC
Genres: Animation, Comedy
Production Companies: Total Television Productions, Leonardo Productions
Synopsis
Underdog, also known as The Underdog Show, is an American Saturday morning animated television series that ran from October 3, 1964, to March 4, 1967, starting on the NBC network until 1966, with the rest of the run on CBS, under the primary sponsorship of General Mills, for a run of 62 episodes. It is one of the early Saturday morning cartoons. The show continued in syndication until 1973. Underdog, Shoeshine Boy's heroic alter ego, appears whenever love interest Sweet Polly Purebred is being victimized by such villains as Simon Bar Sinister or Riff Raff. Underdog nearly always speaks in rhyming couplets, as in "There's no need to fear, Underdog is here!"
Cast

Wally Cox

Sandy Becker

Kenny Delmar

George S. Irving

Mort Marshall

Norma MacMillan

Delo States

Ben Stone

Allen Swift