1. The Box

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. 12 January 1998. 20 min

Mark and Lisa need to help their Uncle George (the current guardian) stop an ancient box from being opened. The box is a doorway to a slave world.

2. The First Key

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. 19 January 1998. 20 min

George, Mark and Lisa begin the search for the three keys to the box. Lisa is awakened during the night by people who think her uncle has the first key.

3. The Watchers

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. 26 January 1998. 20 min

Lisa and Mark are searching for the second key; when they find it, the Watchers try to kidnap them.

4. Kidnap

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. 2 February 1998. 20 min

Having escaped from the attempted kidnap by the Watchers, the twins join up their Uncle George to locate the third and final key at the Roman baths.

5. The Crystal Connection

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. 9 February 1998. 20 min

Now having all three keys, George and the twins persuade Professor Waters let them in to see the box.

6. The Trap

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. 23 February 1998. 20 min

George breaks into the Janus Foundation to try to steal the box back, but then Mark and Lisa realise it is, in fact, a trap.

7. The Box is Opened

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. 2 March 1998. 20 min

The gateway to the world of Heritron is now opened. George and the twins escape from the Janus Foundation, but are then betrayed.

8. Into the Box

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. 9 March 1998. 20 min

Professor Waters retrieves the Box back from the Watchers' Headquarters, and George goes through the portal to lock the doorway into Heritron forever. The Catchers are waiting for him on the other side.

9. Betrayed

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. 16 March 1998. 20 min

George is held against his will on Heritron. Anna tells Mark and Lisa that they must rescue him.

10. The Final Hour

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. 23 March 1998. 20 min

The twins find George imprisoned in a crystal cell. They manage to break him free, but can they escape from Heritron and get back home?