Spencer (also known as Classic Spencer) is an engine in the Classics theme.
- Racing Spencer
- Mono Spencer
- Spencer as Cyborg
- Electrified Spencer
- Spencer as Gary (from SpongeBob SquarePants 9-Pack)
- Launcher Spencer (from Spencer Launcher)
- Spencer as Doomsday (from DC Super Friends 9-Pack 3)
- Spooky Spencer (from Spooktacular! Pop-Up Playset)
- Shark Spencer
- Space Spencer
- Spencer as Rocksteady (from Teenage Mutant Ninja Turtles 9-Pack)
- Dragon Spencer
- Monkey Spencer
- Neon Glow Spencer (from Neon Glow in the Dark Pack 1)
- Sushi Spencer
- The first prototype Spencer features a silver whistle.
- Spencer is one of fourteen engines in the 2018 series not to receive a Classics variant.