The Thornberrys are visited by the Foundation's head son, Tom, who splits up the Nigel and Marianne team. An over-zealous Tom treats Eliza like a child until he lands the Commvee in a raging river. Eliza's quick thinking prevails and she saves her family and wins Tom's respect.
| Name | Type | Role | |
|---|---|---|---|
| Michael Rosenbaum | Guest Star | ||
| Jeff Coopwood | Guest Star |