Jenny is Wendy's sister. Jenny acts flirtatious around Bob sometimes. She has shorter and lighter blonde hair than Wendy does. She appears in some episodes and was first indirectly mentioned in the episode, Bob's Big Surprise (Season 2), though her name wasn't mentioned yet.
- Season 2 - Bob's Big Surprise (mentioned)
- Season 5 - Wendy's Surprise Party and Eskimo Bob
- Season 6 - Lofty and the Giant Carrot (mentioned)
- Season 7 - Dizzy Goes Camping
- Season 8 - Ballroom Bob (cameo) and Molly's Fashion Show
- Season 9 - Scoop the Disco Digger and Spud's Statue (cameo)
- Bob's Big Plan (2005; cameo)