Cast
- Spongebob as Marlin
- Patrick as Nemo
- Sandy as Dory
- Robot Jones (from Whatever Happened to Robot Jones?) as Nigel
- Mr. Krabs as Gill
- Squillam as Bloat
- Emily (from Thomas and Friends) as Peach
- Boomer (from TUGS) as Gurgle
- Squidward as Bubbles
- Pearl as Deb
- Bash, Dash, and Ferdinand (from Thomas & Friends: Misty Island Rescue) as Jacques
- Dennis as Bruce
- The Yogman Twins (from Whatever Happened to Robot Jones?) as Anchor and Chum
- Larry as Crush
- Gary as Squirt
- Karen as Darla
- Plankton as Dentist
- Mindy as Coral
- Diesel 10 (Thomas and the Magic Railroad) as Barracuda
- Chinese Dragon (from Thomas and Friends) as Anglerfish
- Jellyfish as Seagulls
- Ten Cents (from TUGS) as The Whale