Hi question about the Thomas shows

there are episodes where hiro reappears, not sure what they are called or the series, just seen them on tv. lol

According to Thomas Wikipedia, Hiro appeared from Season 13-18. Below are the Episodes he appeared in.

Television series
■ Season 13 - The Biggest Present of All, Buzzy Bees, and Hiro Helps Out
■ Season 14 - Thomas' Tall Friend (cameo), James in the Dark (cameo), Toby and the Whistling Woods (cameo), and Henry's Health and Safety
■ Season 15 - Emily and Dash, Happy Hiro, Kevin the Steamie (cameo), Wonky Whistle (cameo), and Fiery Flynn
■ Season 16 - Race to the Rescue (cameo), Express Coming Through (cameo), Ho Ho Snowman (cameo), Flash Bang Wallop! (cameo),Thomas and the Rubbish Train (cameo), Thomas Toots the Crows (cameo), and Sodor Surprise Day (cameo)
■ Season 17 - Henry's Hero, The Lost Puff (cameo), Percy's Lucky Day, Away From the Sea (cameo), and No More Mr. Nice Engine
■ Season 18 - Not So Slow Coaches