Diesel's New Friend is the fifth episode of the second season.
A new diesel arrives on Sodor and Diesel quickly becomes friends with her
- This episode marks the introduction of Rose, Dawn, Levi, Bulstrode, and Marie.
||Sierra's Birthday Adventure | James and the New Engine | A New Friend for Rosie | Maddox and the Signal | Diesel's New Friend | Insignificant | Blisters | Twin Day | James' Day Out | Murdoch and Neville | A Dirty Day for Daniel | An Arlesdale Adventure | A Bad Day for Diesel | A Day for the Diesels | Quadruplets | Quads, Quarries, and Quarrels | Kids and Quarrels | Paige Returns | Crystal Island Adventure | Little Engines Can Do Big Things | Jack of Many Trades | Marion Makes a Move | Rosie's Old Friend | Rose's Backstory | Marie's Backstory | Dawn and Levi's Backstory | Jacob, Sierra, and Rylie's Backstory | Football | Brady and the Famous Visitor
||Sierra's Birthday Adventure/Transcript | James and the New Engine/Transcript | A New Friend for Rosie/Transcript | Maddox and the Signal/Transcript | Diesel's New Friend/Transcript | Insignificant/Transcript | Blisters/Transcript | Twin Day/Transcript | James' Day Out/Transcript | Murdoch and Neville/Transcript | A Dirty Day for Daniel/Transcript | An Arlesdale Adventure/Transcript | A Bad Day for Diesel/Transcript | A Day for the Diesels/Transcript | Quadruplets/Transcript | Quads, Quarries, and Quarrels/Transcript | Kids and Quarrels/Transcript | Paige Returns/Transcript | Crystal Island Adventure/Transcript | Little Engines Can Do Big Things/Transcript | Jack of Many Trades/Transcript | Marion Makes a Move/Transcript | Rosie's Old Friend/Transcript | Rose's Backstory/Transcript | Marie's Backstory/Transcript | Dawn and Levi's Backstory/Transcript | Jacob, Sierra, and Rylie's Backstory/Transcript | Football/Transcript | Brady and the Famous Visitor/Transcript
||Sierra's Birthday Adventure/Gallery | James and the New Engine/Gallery | A New Friend for Rosie/Gallery | Maddox and the Signal/Gallery | Diesel's New Friend/Gallery | Insignificant/Gallery | Blisters/Gallery | Twin Day/Gallery | James' Day Out/Gallery | Murdoch and Neville/Gallery | A Dirty Day for Daniel/Gallery | An Arlesdale Adventure/Gallery | A Bad Day for Diesel/Gallery | A Day for the Diesels/Gallery | Quadruplets/Gallery | Quads, Quarries, and Quarrels/Gallery | Kids and Quarrels/Gallery | Paige Returns/Gallery | Crystal Island Adventure/Gallery | Little Engines Can Do Big Things/Gallery | Jack of Many Trades/Gallery | Marion Makes a Move/Gallery | Rosie's Old Friend/Gallery | Rose's Backstory/Gallery | Marie's Backstory/Gallery | Dawn and Levi's Backstory/Gallery | Jacob, Sierra, and Rylie's Backstory/Gallery | Football/Gallery | Brady and the Famous Visitor/Gallery
||Characters With Main Roles
||Sierra | James | Ralph | Rosie | Madison | Maddox | Diesel | Rose | Dawn | Levi | Marie | Spencer | Blister I and Blister II | Bill and Ben | Murdoch | Neville | Daniel | Hank | Dailey | Dawson | Damian | David | Jacob | Paige | Mallory | Rex | Jack | Marion | James (human) | Brady
||Ralph | Madison | Rose | Dawn | Levi | Marie | Spencer | Blister I and Blister II | Daniel | Dailey | Dawson | Damian | David | Paige