Gerald Nicknamed Gator is a Large Green Tank Engine who Resembles an Alligator.
- Season 11: Trembling Trevor, Old Square Wheels and BoCo and the Cocoa.
- Season 12: Greetings, Montague! (does not speak) and Scottish Blues.
- Season 13: Rust or Bust (cameo), Go Boldly, Culdee (cameo) and How Gator Stole Christmas.
- Season 14: Millie's Castle Hassle, Hiro and the Heat Wave (cameo), Cabless Companions (cameo),
- Season 15: Toby's Turntable Fable, The Island of Misftis Engines (cameo)
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