Mallard and The Stouth Baby/Mallard the Blue Tender Engine is the 23th episode of Big City Engine the Tender Engine and Friends and the 23th episode of Season 1.
- Mallard (from RWS) as Toby
- Millie as Henrietta
- Stewie Griffin (from Family Guy) as Sir Topham Hatt
- Angelica Pickles (from Rugrats) as Lady Hatt (Not named)
- Evil Monkey (from Family Guy) as Stephen Hatt (Not named)
- Martha Monkey (from Noddy's Toyland Advatures) as Bridget Hatt (Not named)