Sproggle's birthday is coming soon and the young orphan wants a pet but Captain Thrice won't allow one on board the Paradox. Unknown to the captain, Sproggle is given an invisible dog called Wearizy by junkyard twins Twaddle Duff and Twaddle Dim. There's more trouble when Dr. Agon gatecrashes Sproggle's birthday.
| Name | Type | Role | |
|---|---|---|---|
| Gerry Anderson | Writer | ||
| Rob Rackstraw | Guest Star | ||
| Chris Taylor | Director | ||
| Gerry Anderson | Director |