A Martian uncle, his nephew and and their dog are stuck on Earth after their spaceship crash landed. Not wanting to be discovered, the Martians assume the identity of Katy's Uncle Martin and his nephew Andy. Katy and his uncle Tim O'Haras are the only ones who know their real identity. Reappeared in 1977 as a segment on The Groovie Goolies and Friends.

• Howard Morris
• Jane Webb
• Jonathan Harris
• Lane Scheimer